Appellants, who are brothers, were jointly charged in a three-count indictment with first-degree (felony) murder while armed, D.C.Code 1973, §§ 22-2401, -3202; second-degree murder while armed, id., §§ 22-2403, -3202; and armed robbery. Id., §§ 22-2901, -3202. A jury acquitted them of murder but convicted them of armed robbery. *417 Both appellants contend that the trial court erred in denying their motions to dismiss the indictment on speedy trial grounds. Individually, Maurice Johnson contends that his conviction violates the constitutional prohibition against double jeopardy. Michael Johnson contends (1) that the admission of a prior consistent statement of the government’s principal witness was prejudicial error, and (2) that the trial court erred in denying his motions for a judgment of acquittal. We affirm.
I
Jimmy Robinson, while either asleep or in an alcohol-induced stupor, was beaten to death with a lead pipe and robbed of three dollars. 1 Appellants and Oscar Lee Scott had been drinking with Robinson in the vacant house where his body was found. They split the proceeds among themselves, thus netting a dollar apiece.
Scott, who pleaded guilty to second-degree murder in connection with Robinson’s death, was the government’s key witness, Scott testified that he had spent the night before the murder with his girl friend in a vacant house on Wylie Street in northeast Washington. Early the next morning, after his girl friend had left, Scott joined appellants (whom he knew as “Wee-Wee” and “Tootsie”), Robinson, and two others who were drinking in the vacant house next door to where he had slept.
When the two men who were with them had left, Wee-Wee (appellant Maurice Johnson) asked Scott if he had any money so that he could buy more liquor. Tootsie (appellant Michael Johnson) told his brother that Robinson, who was sitting on the couch, had $60. Wee-Wee decided that he would take the money from Robinson and asked Scott if he wanted to be in on it. Scott declined, but followed Wee-Wee to an adjoining room where Wee-Wee picked up a pipe and wrapped a shirt around it, planning to “knock [Robinson] out” with it. Tootsie remained in the room with Robinson until Scott and Wee-Wee returned. When Wee-Wee raised the pipe with both hands, Scott went next door for a drink of water. Upon his return moments later, Wee-Wee still was holding the pipe and Robinson was lying on the couch. Appellants rolled their victim onto the floor and went through his pockets, retrieving the three dollars which they and Scott split three ways. Michael Johnson removed his bloodstained pants, and directed Scott to throw them away while he put on another pair from a bag of clothes which he kept in the house. Scott and appellants then left.
The extent of Scott’s involvement in the killing was disputed by the testimony of other witnesses. Debra Cabbell, his girl friend, testified that, later on the day Robinson was killed, Scott told her that he had been in a fight and that “he beat somebody’s ass.” Scott denied having made that statement to Cabbell, or even having seen her again that day. Kathryn Mary Gross, who dated Scott’s brother, testified that on the day of the offense, Scott telephoned her and asked if he could come over since he had been in a fight. When he arrived, he told her he had been fighting over money in an empty house on Wylie Street. At that time, he did not mention that anyone else had been involved. Scott admitted having gone to Gross’ house that day, but denied having told her he had been in a fight.
Finally, Rosemary Bartley, Maurice Johnson’s girl friend, testified that she saw Scott some time after the killing. He told her that he had been in a fight with Robinson, and that “[h]e had picked up a piece of pipe and hit him.” She testified further that Debra Cabbell had told her that Scott had made the same inculpatory remark to her. Scott denied ever having talked to Bartley about the events surrounding Robinson’s death.
Neither appellant testified.
II
Both appellants contend that they were denied their Sixth Amendment right to a *418 speedy trial. Michael Johnson was arrested and charged with second-degree murder on August 24, 1977, ten days after Robinson’s death. A month later, Maurice Johnson was arrested on the same charge. On December 22, 1977, the charges against appellants were dropped by the government for lack of sufficient evidence. Eight months later, on August 16, 1978, Oscar Lee Scott pleaded guilty to second-degree murder in the case. At that time, he agreed to testify against appellants both before a grand jury and at trial. On October 4,1978, appellants were indicted. They went to trial four months later.
Appellants contend that the nine- and-a-half-month period between the dismissal of charges against them and their subsequent indictment is chargeable to the government. Accordingly, the period of time between their initial arrests and the trial (18 months for Michael Johnson; 17 months for Maurice Johnson) would give prima facie merit to their speedy trial claim and place a burden on the government to justify the delay.
Branch v. United States,
D.C.App.,
It is well recognized that the government is under no obligation to file charges against a defendant at any particular time.
See United States v. Lovasco,
In sanctioning a pre-indictment delay of 18 months we noted in
Tolliver v. United States, supra,
that “[ijnvestigative delay is fundamentally unlike delay undertaken by the government solely to gain tactical advantage over the accused.”
Moreover, there was no prejudice from the earlier dismissal of charges against them and their subsequent indictment. As expressed by another court:
During this period appellants were] not subject to any of the disabilities associated with being under arrest, the subject of a complaint or indictment, or in the midst of a criminal prosecution. [They were] under no more jeopardy than any other citizen, and the fact that [they] might have been under investigation has no more effect after the dismissal on the running of the [speedy trial period] than it would have had before [their] arrest, that is, none. [United States v. Flores,501 F.2d 1356 , 1359-60 (2d Cir. 1974).]
Accord, People v. Sanders, supra,
*419 Having determined that the trial court properly excluded from its speedy trial analysis the period of time between the original dismissal of charges and the later indictment, we turn to the intervals of time which should be considered in evaluating appellants’ speedy trial claim. Four months elapsed between Michael Johnson’s initial arrest and the dismissal; for Maurice Johnson, it was three months. The interval between appellants’ subsequent indictment and trial was four months. Consequently, the total period of time (again, excluding the investigatory period) in Michael Johnson’s case was eight months. For Maurice Johnson, it was seven months.
“In cases of a time lapse of less than a year, prejudice must be affirmatively demonstrated by a defendant.”
Towles v. United States,
D.C.App.,
Nor was appellants’ defense impaired, as they unpersuasively contend. In their original motion, appellants complained of the supposed unavailability of two witnesses. However, those witnesses were available at trial and were not called by the defense. Moreover, at appellants’ behest, the trial court wisely refrained from ruling on their motion to dismiss before trial, choosing instead to wait until all the evidence had been presented in order to be able to assess properly the impact of the delay on appellants’ defense. After careful evaluation, the court found that appellants’ ability to present a defense had not been impaired. There was no error in the denial of their motion to dismiss the indictment on speedy trial grounds.
III
In the course of its deliberations, the jury returned a partial verdict with respect to appellant Maurice Johnson, finding him guilty of robbery and not guilty of felony murder. Upon advising the trial court that it had reached no decision on the two remaining counts (second-degree murder while armed and armed robbery), the jury was instructed to resume deliberations until it could arrive at a unanimous verdict on those counts. Appellant moved for a mistrial on double jeopardy grounds, arguing that the jury’s partial verdict on the lesser-included offense of robbery foreclosed further consideration of the charge of armed robbery. The motion having been denied by the trial court, appellant renews his argument on appeal. We find it to be without merit.
“The constitutional prohibition against ‘double jeopardy’ was designed to protect an individual from being subjected to the hazards of trial and possible conviction more than once for an alleged offense.”
United States v. DiFrancesco,
At no time was appellant subjected to the hazards of a second trial. The jury’s partial verdict reflected nothing more than a need for further deliberation on the remaining counts. That is, the jury’s silence at that stage of its deliberations was not tantamount to an implied acquittal of the second-degree murder while armed and armed rob
*420
bery counts.
Cf. Green
v.
United States, supra
(where jury returned final verdict convicting defendant of second-degree murder while remaining silent as to the charge of first-degree murder, that silence was an implicit acquittal barring retrial on the greater charge). Such a result obtains only when a jury has been discharged.
Id.,
Moreover, it appears that appellant acquiesced in the procedure followed by the trial court. In response to -appellant’s objection on double jeopardy grounds, the trial judge stated:
Counsel agreed that we would send all counts to the jury. We would not tell the jury of the lesser included offense; however, if the jury indicated, as it has in the case of Mr. Michael Johnson, brought back both the robbery and armed robbery, we would throw out the robbery. Counsel agreed to that.
Consistent with that understanding, the jury verdict forms did not designate robbery as a lesser-included offense, nor did appellant request that the jury be instructed to consider robbery as a lesser-included offense only if it first determined to acquit on the greater offense. We see no error in the trial court’s receiving the partial verdict and allowing the jury to resume deliberations on the remaining counts.
See United States v. Butler,
IV
Appellant Michael Johnson challenges the admission of a prior consistent statement made by the government’s chief witness, Oscar Lee Scott, to a witness for the defense, Kathryn Mary Gross. On cross-examination, Gross testified that, some time after Scott’s arrest, she visited him in jail. 3 The transcript then reflects the following:
Q. What did he say, when you saw him at the jail?
A. On one occasion, we were talking and he said something about Kat, he said, Kat, why isn’t Tootsie [appellant] in here with me in jail?
In response to further questioning, and over defense objection, Gross testified that Scott told her “that he couldn’t understand why Tootsie wasn’t locked up” and that he was not “taking the rap by [himjself.” The trial court ruled that this hearsay testimony was admissible as a prior consistent statement since it substantially comported with the declarant’s testimony at trial. The court did not err in its ruling. 4
It is, of course, well established that prior consistent statements may not be used to support the testimony of an unim-peached witness.
Rease v. United States,
D.C.App.,
Both circumstances existed in this case. Scott was impeached with the prior inconsistent statement he gave to the police three days before his arrest. In it, before he gave a written statement at the time of his arrest which was consistent with his trial testimony, he denied any knowledge of the circumstances surrounding Robinson’s death because, as he said at trial, he “didn’t want to get involved.” In fact, the entire defense centered on challenging Scott’s credibility. Consequently, “testimony [reflecting a prior consistent statement] was plainly relevant and proper to an evaluation of the credibility of the ... witness which was under attack.”
Copes v. United States, supra,
Moreover, on cross-examination appellants tried to establish Scott’s motive for lying — namely, that Scott had not been sentenced yet and may have hoped for leniency in exchange for cooperation with the government. “At first blush it might appear that one who accepts a plea bargain, on the condition of testifying in the prosecution of others, would have a motive to invent a case against the others.”
United States v. Sampol, supra,
V
Finally, appellant Michael Johnson argues that the evidence against him is insufficient to sustain his conviction of armed robbery. He contends that even viewing the evidence in the light most favorable to
*422
the government,
see McEachin v. United States,
D.C.App.,
Appellant’s attempt to portray himself as a mere bystander to the assault is unavailing. “If a defendant is present at the scene of a crime without opposing or disapproving the acts, the trier of fact can, in consideration of all the circumstances, infer that he has consented to those acts, and has aided and abetted them.”
People v. Fuller,
Appellant need not necessarily have intended the particular crime which was committed by the principal in order to be liable for what occurred.
Hackney v. United States,
D.C.App.,
Affirmed.
Notes
. An autopsy disclosed that, at the time of his death, the victim’s blood alcohol level was nearly three times the amount at which one is presumed to be intoxicated if driving.
. “... nor shall any person be subject for the same offence to be twice put in jeopardy of life orlimb....” U.S.Const. amend. V.
. Gross, who had dated Scott’s brother for five years, was a close family friend, having known Scott since he was two years old.
. The trial court should have given a limiting •instruction after the statement was introduced, but no such instruction was requested. The court’s oversight was not plain error.
United States v. Alexander,
. Nowhere does the record reflect whether Scott’s conversation with Gross when he was in jail occurred before or after his decision to plead guilty, that is, before or after his alleged motive to fabricate arose. We conclude that Scott had no apparent motive to lie to that particular witness, and deem this gap in the record to be immaterial. Likewise, we reject any negative implication arising from the fact that Scott’s initial denial of involvement in Robinson’s murder predated his challenged statements to Gross implicating appellant. “There is no requirement that the prior consistent statement have been made before the prior inconsistent statement.”
United States v. Sam-pol, supra,
. On redirect examination, Debra Cabbell, Scott’s girl friend, was questioned as follows:
Q. Did he [Scott] ever tell you, when you visited him in jail or at any other time prior to him even being arrested, did he tell you that he wasn’t going to take the beef for something he didn’t do?
A. Yes.
