The defendants appeal from convictions, following a jury trial, of murder in the first degree and unarmed robbery. The murder convictions were based on the felony-murder doctrine. The defendants argue that that doctrine, as it has previously been applied in this Commonwealth, is unconstitutional and therefore that it was error for the judge to instruct the jury on felony-murder. We hold that the doctrine is constitutional. However, we examine the felony-murder doctrine as it applies to the common law felony of unarmed robbery, and hold that it was error to instruct the jury that the malice necessary to convict of murder is supplied solely by participation in an unarmed robbery. Accordingly, we reverse the murder convictions. We also reverse the unarmed robbery convictions on the ground that severance of the trial of the defendants was required. We affirm the denial of Moran’s motions for required findings of not guilty.
We recite some of the facts that the jury could have found, reserving others for discussion in conjunction with specific issues raised. The defendants briefly conversed with the victim, William Wronski, outside a bar in Adams on the evening of August 14, 1980. Following that conversation, Wronski and the defendants entered the bar, and Wronski bought them one or more drinks. Wronski left the bar and walked up the street to his pick-up truck. The defendants left the bar and followed Wronski up the street. There was a confrontation at the truck. One or both defendants hit Wronski several times about the head. The defendants placed Wronski in the cab of his truck.
Wronski was intoxicated and had recently eaten a full meal. Because of this intoxication, the blows to his head, and the position of his body in the truck, Wronski vomited *646 some time that night, aspirated the vomit, and was asphyxiated. His body was discovered in the truck the next morning. Wronski’s wallet, containing no money, was found in a nearby river a day later.
1. Sufficiency of the evidence. At the close of the Commonwealth’s case, Moran moved for required findings of not guilty on the charges of unarmed robbery and murder. The motions were denied, and Moran appeals, contending that the evidence introduced by the Commonwealth was insufficient for the jury to conclude that he intended to take or did take Wronski’s wallet, or that he formed such an intent before or during the assault. Based on these contentions, Moran argues that he would not be guilty of either robbery or felony-murder predicated on robbery.
Robbery may be punished more severely than larceny from the person. Compare G.L. c. 265, § 19, with G. L. c. 266, § 25. The principal policy served by this greater punishment is deterrence of the use of force (and the accompanying risk to human life) to obtain money or other property. See M.C. Bassiouni, Substantive Criminal Law 336 (1978). This policy is not served where the intent to steal is not formed until after the assault. We conclude, therefore, that where the intent to steal is no more than an afterthought to a previous assault, there is no robbery. See
Commonwealth
v.
Rego,
Evidence of the following facts was admitted against Moran as part of the Commonwealth’s case to prove his participation in the robbery. On the evening of his death, Wronski had at least $70, which he had put into his wallet, and with which he bought one or more drinks for the defendants in the bar. After Wronski had left the bar and had walked toward the truck, Moran emerged from the bar and told Chenail to go and get Wronski because he owed them another drink. Chenail and Moran then both jogged after *647 Wronski. Two witnesses driving by saw someone wearing clothing like that worn by Moran, punching another person inside the truck. Wronski’s body was found the next morning, and his wallet without money was found in a nearby river a day later.
Moran argues that this evidence shows only that he had an opportunity to take Wronski’s wallet and does not permit an inference that he either intended to or did take it, or that he formed such an intent before or during the assault. We disagree. Criminal intent generally can be proved only by inferences from facts, and those inferences need only be reasonable.
Commonwealth
v.
Casale,
2.
Constitutionality of the felony-murder rule.
Both defendants were tried and convicted of murder based solely on the application of the felony-murder rule. They objected to the judge’s instructing the jury on felony-murder, arguing that felony-murder “as structured in Massachusetts” is unconstitutional. The defendants’ argument is based on
Sand-
*648
strom
v.
Montana,
The felony-murder rule is that a homicide committed in the commission or attempted commission of a felony is murder. The rule is defined by common law and is the law of this Commonwealth.
Commonwealth
v.
Matchett,
We have said that “[t]he effect of the felony-murder rule is to substitute the intent to commit the underlying felony for the malice aforethought required for murder.”
Commonwealth
v.
Matchett, supra.
This statement suggests that malice aforethought is not an essential element of murder in the circumstances of a homicide occurring in the course of a felony. See
People
v.
Aaron,
3.
Applicability of the felony-murder rule.
We observed in
Commonwealth
v.
Matchett, supra
at 504-505, that “[t]his court has never automatically applied the felony-murder rule without viewing the facts of the case” and that “[w]e have never delineated exactly which felonies give rise to application of the rule.” In
Matchett,
we held that, where the underlying felony is extortion, the defendant cannot be convicted of murder based on the felony-murder rule, unless the jury find that the extortion involved circumstances demonstrating the defendant’s conscious disregard of the risk to human life.
Id.
at 508. Since trial of the present case was completed before
Matchett
was decided, and substantial justice requires proper application of the felony-murder rule, we review the judge’s jury instructions on felony-murder even though the defendants’ objection was to the constitutionality of the rule and not to its common law application to the facts of this case.
Commonwealth
v.
Stokes,
The holding in Matchett was based on our recognition that extortion can be committed without danger to human life and on the principle that “criminal liability for causing a particular result is not justified in the absence of some culpable mental state in respect to that result.” Matchett, supra at 507, quoting from Gegan, Criminal Homicide in the Revised New York Penal Law, 12 N.Y.L.F. 565, 586 (1966). “A felony-murder rule that punishes [as murder] all homicides committed in the perpetration of a felony whether the death is intentional, unintentional or accidental, without the necessity of proving the relation of the perpetrator’s state of mind to the homicide, violates [this] most fundamental principle . . . .” Matchett, supra at 506-507.
*651
Though
Matchett
involved only felony-murder based on extortion, its principle applies as well to felony-murder based on unarmed robbery. Unarmed robbery is not inherently dangerous to human life. Purse snatching can be robbery, see
Commonwealth
v.
Jones,
The judge instructed the jury that the “malice aforethought that is required in murder is supplied by the participation in a felony so serious as to call for life imprisonment.” Because the judge gave no instruction that the jury must find conscious disregard of risk to human life in order to apply the felony-murder rule, we reverse the murder convictions. 3
4. Severance. Before trial Moran moved for severance of his trial from that of Chenail. The following reports of oral statements made by Chenail to the police were made known to the judge at the hearing on the motion. A report written by Officer Stanley Misiuk stated: “Chenail told me that he did observe Wronski at Chick’s sitting right next to Timothy Moran and two seats from him. It seems Moran was arguing with Wronski about buying some drinks. Wronski left the bar at about 11:30 p.m. and Chenail and Moran followed. Chenail said he stayed by Chick’s while Moran headed south on Columbia Street toward Wronski. Chenail then went south on Columbia Street and caught up with Moran but Wronski was already in his truck. Wronski got *652 out of his truck and he and Moran were arguing. Moran started shoving Wronski and they fell to the ground. Wron-ski got back up and both he and Chenail pushed Wronski around a little bit. Chenail then left and went to Moran’s car which was parked in the Town House parking lot. Che-nail said Moran returned with Wronski’s wallet and they split twenty dollars. They then drove to North Adams where they traveled west on Route 2, State Street, until they came to a bridge right before Mt. Greylock Bowl, where Moran stopped the car on the bridge, got out and threw the wallet into the Hoosac River on the north side of the bridge. Chenail said he did not lay a hand on Wronski, but does not want to implicate anyone else. Chenail did admit to spending the money.” The following statement was reportedly made by Chenail to State Police Lieutenant Roy F. Sibley: “I’ll admit to my part as far as the wallet, but I know nothing about any beating or killing.” In response to Lieutenant Sibley’s question as to how much money he got, Che-nail reportedly said, “Twenty — we split twenty dollars.” Although the statements contained admissions that Chenail was at Wronski’s truck at a relevant time and that Chenail pushed Wronski around and shared in the money taken from Wronski’s wallet, the primary effect of Chenail’s statements was to exculpate Chenail and inculpate Moran. According to the statements, Moran took Wronski’s wallet in Chenail’s absence and any significant beating of Wronski took place after Chenail left Moran with Wronski. The judge was also told that the Commonwealth planned to introduce evidence that Moran was asked by an inmate at the Berkshire County house of correction, “[W]ho did you kill?”, and Moran replied, “[Sjome retarded jerk that needed it for a long time ... so we did him the favor.”
Moran argued that Chenail’s statements would be offered by the Commonwealth against Chenail, that they would seriously prejudice Moran despite any instruction that the jury should only consider them in the case against Chenail, and that Moran was not assured of an opportunity to cross-examine Chenail, and thereby would be denied his Sixth
*653
Amendment right to confront witnesses against him. See
Bruton
v.
United States,
*654 The prosecutor included in his opening statement at trial a recitation of expected evidence: that the defendants followed Wronski to his truck, that some violence occurred there at that time, that Wronski’s wallet was taken, that Wronski sustained a fractured skull and multiple bruises to the face, and that he died, partially as a result of the trauma he had sustained. He recited the defendants’ statements as edited in accordance with the judge’s order. Near the end of his opening, the prosecutor said, “That, in essence, is the Commonwealth’s case. . . . We don’t have eye witnesses to these events. What we have are some admissions. What we have are witnesses who place Timothy Moran and Matthew Chenail in the company of William Wronski when civilian witnesses put a beating occurring in that position and that place.” At the conclusion of the prosecutor’s opening, Moran again moved for severance and the motion was denied.
Chenail’s counsel made an opening statement immediately following that of the prosecutor. Chenail’s counsel told the jury that Chenail would take the stand despite his right to remain silent and would testify that he accompanied Moran to Wronski’s truck, that he saw Wronski lunge and saw Moran punch him once, and that after helping put Wronski back into the truck he left. Counsel also predicted that Chenail would testify that he knew nothing about the wallet until Moran joined him at the car. In short, the opening indicated that Chenail’s testimony would parallel the full statement he gave to Officer Misiuk.
On direct examination by the Commonwealth, after a jury instruction limiting the evidence to Chenail’s case, Officer Misiuk testified to Chenail’s statement as edited by the judge’s pretrial order. On cross-examination by Chenail, over Moran’s objection, Officer Misiuk testified fully to Chenail’s unedited statement inculpating Moran. During this cross-examination the judge again instructed the jury that the evidence was admissible only against Chenail. Moran unsuccessfully renewed his motion to sever and moved for a mistrial. Later, over Moran’s objection, Lieutenant Sibley testified to Chenail’s statement set forth above.
*655 Moran’s counsel gave his opening statement at the close of the Commonwealth’s case. Moran and Chenail testified. Moran told the jury that he did hit Wronski once, but that he then turned away for a moment, and, when he looked back, Chenail was bending over the fallen Wronski, whose face was then bloody. He also testified that Chenail’s hands were bloody and that it was Chenail who noticed the wallet and told him to take it. Chenail testified as his opening statement indicated.
Each defendant was cross-examined extensively by counsel for the other. Cross-examination brought out a number of inconsistencies in each defendant’s testimony and reemphasized those portions of the Commonwealth’s evidence that were particularly damaging to the defendant being cross-examined.
Because Chenail took the stand and was cross-examined by Moran’s counsel, there was no denial of Moran’s right to confront witnesses against him.
Bruton
v.
United States,
“If it appears that a joinder ... of defendants is not in the best interests of justice, the judge may upon his own motion or the motion of either party . . . grant a severance of defendants, or provide whatever other relief justice may require.” Mass. R. Crim. P. 9 (d) (1),
In
United States
v.
Crawford,
Other Federal Courts of Appeal have applied the rule and reasoning of
Crawford.
In
United States
v.
Ziperstein,
In
Johnson
v.
United States,
Decisions of the courts of several States accord with the principle enunciated in the cases referred to above. In
People
v.
Hurst,
In Murray v. State,
In this Commonwealth severance is usually a matter within the sound discretion of the trial judge.
Commonwealth
v.
Cepulonis,
This is not a case of codefendants merely pursuing inconsistent trial strategies, as in
Commonwealth
v.
Horton,
Failure to sever in such circumstances has several unacceptable consequences. First, each codefendant’s jeopardy invites his perjured testimony, to the detriment of the other codefendant. The Commonwealth’s use of such testimony to obtain a conviction is fundamentally unfair and does not serve the public’s interest in justice. Second, where there is convincing evidence that a crime has been committed by at least one of the defendants, a jury, disinclined for any reason to convict a particular defendant, may be inclined to find the other guilty. There is a danger that the jury will feel compelled to choose between defendants rather than to assess the proof against each defendant separately. Finally, with one defendant pitted against the other, there is a danger that the jury will unjustifiably infer from the conflicting defenses alone that both defendants are guilty.
Rhone
v.
United States,
The denial of a requested severance does not require reversal unless the request is made at a time when the necessity for severance has been firmly established. A premature request for severance, not renewed when the necessity to sever *660 has been established, is not sufficient. Here, it appeared likely from pretrial discussion that each defendant would attempt to escape conviction by blaming the other, and that the jury would hear the defendants’ complete extrajudicial statements inculpating one another. In addition, the effect of Chenail’s opening was a promise that Chenail’s testimony would fully inculpate Moran. Finally, on cross-examinatian of the Commonwealth’s witness, Officer Misiuk, Che-nail’s counsel elicited Chenail’s entire extrajudicial statement placing responsibility on Moran for the beating of Wronski. Moran then renewed his motion for severance and moved for a mistrial. At least by this point, Moran’s need for severance and mistrial was not a mere possibility suggested by counsel seeking the advantage of a separate trial. The trial had become unfair as to him. In these circumstances, denial of Moran’s motions requires reversal, and new trials. 6
Moran supported his severance motions by emphasizing that the irreconcilable differences between the defendants’ extrajudicial statements, and between Chenail’s extrajudicial statements and Moran’s defense, violated his Sixth Amendment right to confront witnesses against him. Our decision is based on a rationale only suggested, but not developed, by Moran at the trial. Nevertheless, substantial justice requires reversal of his unarmed robbery conviction. See
Commonwealth
v.
Stokes,
Although Chenail filed a motion for severance before trial, he did not press it or renew it during trial, nor has he *661 argued it here. He seeks reversal of his unarmed robbery conviction on another ground. Nevertheless, at least by the time Moran’s testimony, fully inculpating Chenail, was admitted in evidence, the trial had become unfair to Chenail. In the circumstances of this case, substantial justice requires reversal of Chenail’s unarmed robbery conviction.
Judgments reversed.
Verdicts set aside.
Notes
General Laws c. 265, § 1, does not define the crime of murder nor establish the felony-murder rule.
Commonwealth
v.
Ambers,
The rule we announce today applies to cases that are pending on direct appeal or as to which the time for direct appeal has not expired on the date of this decision. Our decision does not provide a basis for collateral attack of final judgments. See
Linkletter
v.
Walker,
However, the judge’s editing of the testimony of the Commonwealth’s witnesses relative to Chenail’s inculpatory extrajudicial statements was not sufficient to avoid
Bruton
problems. We expressed the view in
Commonwealth
v.
LeBlanc,
Here, one police officer was allowed to testify on direct examination by the prosecutor that Chenail had stated, “[H]e was still alive when
we
left him” (emphasis added). Another police officer, also on direct examination by the prosecutor, testified that when asked how much money he had gotten from Wronski’s wallet, Chenail had responded, “Twenty.
We
split twenty dollars” (emphasis added). Both of these statements were in-culpatory because the use of the term “we,” in the circumstances of this case, clearly included reference to the other defendant. See
Commonwealth
v.
Sarro,
Unfairness to the defendant need not reach the level of deprivation of constitutionally guaranteed due process in order to require severance. In
Commonwealth
v.
McGrath,
Severing the trial of codefendants does not necessarily require mistrial as to both defendants. Here, the trial judge should have granted Moran’s motions for severance and mistrial. However, since Chenail did not timely move for severance, and never moved for mistrial, the judge should have continued Chenail’s trial after granting Moran’s motions. Indeed, the judge having granted Moran’s motions, his failure to continue the trial of Chenail could have barred any retrial of Chenail on double jeopardy grounds.
See Jones v. Commonwealth,
