delivered the opinion of the court:
Following a jury trial, defendant Keith Allen Stanley was convicted of first degree murder and aggravated battery. (Ill. Rev. Stat. 1989, ch. 38, pars. 9 — 1, 12 — 4.) The trial court sentenced Stanley to concurrent terms of 95 years’ imprisonment for murder and 10 years’ imprisonment for aggravated battery. Stanley appeals the convictions and sentences, arguing: (1) the trial court erred in denying his motion attacking the propriety of the jury selection process; (2) the trial court erred in admitting blood-frequency probabilities; (3) the conviction for aggravated battery should be vacated as an included offense of first degree murder; and (4) defense counsel’s failure to present mitigating evidence at sentencing amounted to ineffective assistance of counsel. We affirm in part and vacate in part.
On April 18, 1991, defendant was charged by information with four counts of first degree murder (Ill. Rev. Stat. 1989, ch. 38, pars. 9 — 1(a)(1), (a)(2), (a)(3)) and aggravated battery (Ill. Rev. Stat. 1989, ch. 38, par. 12 — 4(a)). The charges stemmed from an incident that occurred on or about January 6, 1991, in which John Miletta was stabbed and killed. The incident occurred at Miletta’s home, where he lived alone. Miletta was 73 years old at the time of his death, suffered from Parkinson’s disease and Alzheimer’s disease, and walked with a cane.
Carolyn Madison testified she met John Miletta in 1985 or 1986, and did housework for him for four to five years prior to his death. Miletta paid her approximately $200 per month for housekeeping. After four to six months, the two developed a sexual relationship. Madison testified she met defendant at a rehabilitation center in October 1990 and they became intimately involved shortly thereafter. Defendant began going to Miletta’s house to help Madison with the housework. Madison testified that she and defendant forged some of Miletta’s checks.
On January 4, 1991, Madison held a birthday party for her son at her mother’s house, attended by both Miletta and defendant. She drove Miletta home sometime between 7:30 and 9 p.m. She stayed at Miletta’s home overnight and awoke at approximately 10:30 a.m. She and Miletta then got dressed and went to the bank. Miletta attempted to cash a check at the drive-in window but the teller informed him his account balance was extremely low. Miletta went inside the bank and was later joined by Madison. A bank officer told Miletta his account was almost empty and that someone was forging his checks. Madison then told Miletta that defendant was the person forging Miletta’s checks. Miletta appeared visibly upset when the two left the bank at approximately 1 p.m.
Madison returned home alone at approximately 3:30 p.m. where defendant was waiting for her. Madison accused defendant of stealing from Miletta and informed him that Miletta had discovered the forgeries. At approximately 7 p.m., she returned to Miletta’s house, where she received several phone calls from defendant. Madison told defendant she would meet him at a McDonald’s restaurant. She left Miletta’s house at approximately 9:30 p.m. to meet defendant but did not see him at the McDonald’s restaurant so she went home. At approximately 4 a.m., Madison was awakened by defendant, who told her he had driven to Miletta’s house but did not see the car so he left. Defendant was wearing jeans, a green army jacket, and black shoes. Defendant told Madison he was going to leave Springfield and that he had left his mark on Springfield. Defendant stayed with Madison overnight and awoke at approximately 10:30 a.m. Madison drove defendant to the place he was staying at noon, then drove alone to Miletta’s house. She went inside but did not see Miletta. She returned several times to Miletta’s house but each time she found the house empty. The next morning Madison returned to Miletta’s house but he was still not there. Later, the police arrived and she allowed them to search the house. At that time, the police discovered Miletta’s body covered with clothes in the basement.
The police noticed what they believed to be blood on the carpeting, stairway, and kitchen floor. Near the body the police discovered a dented portable propane torch which appeared to have blood smeared on the canister. The police also observed a bedsheet and paper sack covering what appeared to be a blood trail from the | body. When the clothes around the body were removed, the police found the body lying facedown with arms above the head. The police recovered a mop which was behind the kitchen door leading to the basement. The mop had a reddish stain on the sponge and on the handle, and there appeared to be hair on the end of the mop near the sponge. The police also found fingerprints in the reddish stain on the mop handle.
The body had approximately 19 wounds of varying degrees. Dr. Travis Hindman observed two stab wounds in the right shoulder, three wounds to the right of the midline chest, three wounds on the left side at the base of the neck as well as just in front of the left shoulder, a wound along the inside of the lower lip from the left side with damage to a partial denture, a wound over the surface of the base of the thumb joint, a wound at the base of the index finger of the left hand, two wounds to the left side of the back, a wound at the base of the skull on the left side, a wound at the base of the neck, and several wounds on the right side of the back. Hindman stated that some of the injuries were compatible with wounds caused by a knife. Hindman testified that significant force was required to cause the injuries to the lower lip and chest wall, and fracture the skull. He opined the cause of death was hemorrhage due to multiple stab wounds to the body. He testified that the mop and propane tank found at Miletta’s house could have caused several of the wounds observed on the back of the skull.
Madison testified that defendant did not like Miletta and had previously told Madison that he would “fix it” so she didn’t have to go out there anymore. Madison also recalled that on a previous occasion, when she stayed at Miletta’s house, the defendant had discovered her and Miletta sleeping together. While holding a hand sickle, defendant told her that he could have killed both of them. Madison also testified she recalled seeing a knife holder in the kitchen with a full set of six knives. This set was later recovered in the spare bedroom of Miletta’s house with only two knives. She also stated that a set of keys recovered at the foot of the stairs by the police belonged to defendant.
On January 8, 1991, the Madison County sheriffs department arrested defendant. Defendant did not admit to the crime but explained that on the night in question he was at a local tavern and eventually went to Madison’s house at 3 a.m. Defendant told the police that on the following day he left Springfield for East St. Louis.
At trial, the court admitted the mop with the bloody fingerprint, which was shown to match a fingerprint of the defendant, and defendant’s green army jacket and shoes, which were both bloodstained. The jury returned guilty verdicts of first degree murder and aggravated battery. At sentencing, the court found in aggravation that the victim was over 60 years of age and was handicapped, and that the crime was exceptionally brutal and heinous. Ill. Rev. Stat. 1989, ch. 38, pars. 1005 — 5—3.2(b)(4)(ii), (b)(4)(iii), (b)(2).
On appeal, defendant initially contends the trial court erred in denying his motion challenging the jury selection. During jury selection, defendant made an oral challenge to the selection process on grounds that no blacks were in the venire thereby precluding defendant, who was black, from receiving a fair and impartial trial. The trial court replied:
“I’m going to allow you to make that motion, but I am going to continue with the jury process. At this time I haven’t seen a written motion. A motion such as that needs to be in writing so that the State can respond, and during the course of the trial I’ll allow you — you’re not waiving that issue, but we’re going to proceed.”
After the close of the State’s evidence, on the fourth day of the jury trial, defendant filed his written motion. The trial court denied the motion as untimely. At the hearing on defendant’s post-trial motion, defendant again challenged the jury selection process. In denying the motion, the trial court stated that “no evidence” had been presented to show any pattern of excluding blacks from the jury.
Section 114 — 3 of the Code of Criminal Procedure of 1963 expressly provides that an objection to the manner in which a jury panel has been selected or drawn “shall be in writing supported by affidavit and shall state facts which show that the jury panel was improperly selected or drawn” and such motion “shall not be heard after a jury has been sworn to hear the cause.” (Ill. Rev. Stat. 1989, ch. 38, pars. 114 — 3(b), (a).) The Illinois Supreme Court has held that such an objection is to be made before the jury has been sworn. (People v. Gill (1973),
Even if the motion was timely, however, it was properly dismissed because it failed to establish grounds for relief. (People v. Rodriguez (1989),
Next, defendant claims the trial court erred by admitting, over objection, evidence on blood-frequency probabilities because the statistical conclusions in the case lacked foundation and adequate reliability. Prior to trial the defense filed a motion to preclude the State from introducing blood-frequency probabilities, on the grounds that the methodology of electrophoresis was scientifically unacceptable and that the State would be unable to lay a foundation and prove its relevancy to this case. The trial court reserved its ruling and later denied the motion at trial. The evidence at issue concerned the testimony of Phil Sallee, a forensic serologist with the Illinois State Police. Sallee testified to blood testing and blood samples, and used the standard ABO-type testing as well as electrophoresis.
Electrophoresis is the movement of suspended particles through fluid under the action of an electromotive force applied to electrodes in contact with the suspension. (Webster’s New Collegiate Dictionary 364 (1976).) Electrophoresis is one of the steps used in DNA testing:
“The third step is the electrophoresis procedure, which involves placing the DNA in a gel and passing a slight electrical current through the gel. This causes the DNA fragments to move, resulting in their being separated by size from small to large on a continuum.” (People v. Lipscomb (1991),215 Ill. App. 3d 413 , 418,574 N.E.2d 1345 , 1348.)
Electrophoresis of a blood sample causes the different enzymes present in the blood to separate into their protein components. “ ‘After separation, the enzymes and their protein components can be identified and, in this way, the blood can be classified more specifically than is possible by traditional A, B, O blood grouping.’ ” (People v. Partee (1987),
The absence of a certain characteristic in the victim’s blood which is present in the sample to be identified (or vice versa) is conclusive proof that the sample does not contain the victim’s blood. The presence of a characteristic both in the victim’s blood and in the sample to be identified does not conclusively establish that the sample contains the victim’s blood, because other individuals could have the same characteristic in their blood. In this latter situation the most that can be said is that the presence of the characteristic makes the fact that the sample contains the victim’s blood more or less probable in accordance with the frequency with which the characteristic occurs in the population at large. (For example, type A blood occurs in approximately 40% of the population.) As modern science identified additional categories of blood types, however, it became possible to establish that the chances of the sampled blood belonging to anyone other than the victim are remote. If a certain characteristic is found in only one-tenth of the population, another is found in only one-fiftieth of the population, and a third is found in only one-seventy-fifth of the population, the chances of the blood containing all three characteristics belonging to anyone other than the victim are only 1 in 37,500 (10 multiplied by 50 multiplied by 75). This is sometimes referred to as the “product rule.” People v. Miles (1991),
It may be argued that use of the product rule in the present case was improper. The product rule has been explained as follows: “the probability of the joint occurrence of a number of mutually independent events is equal to the product of the individual probabilities that each of the events will occur.” (Emphasis in original.) (People v. Collins (1968),
In this case defendant argues there must be something wrong with expert testimony that the blood on the mop handle occurs one time in every 218 Caucasians, the blood on defendant’s shoe occurs one time in every 549,000 Caucasians, and the blood on defendant’s jacket occurs once in every 123,000 Caucasians, when, according to the theory of the prosecution, all three samples came from the same individual, the victim. The explanation appears to be that the expert could not determine all categories of blood type for each sample taken from the three items. The expert was testing for nine different categories of blood type, but on the mop, for example, was able to determine only four. Even though Sallee was not able to get every category of blood type for every sample and even though the figures differed between the mop, shoes, and jacket, the trial court was not required to exclude the statistical analysis. These circumstances would only go to the weight or reliability of the evidence, not its admissibility. The differences between the number of blood types found would simply be considered by the jury in determining whether the expert’s conclusion was correct. Sallee concluded that the stain on the mop, the stain on the shoe, and both stains on the jacket “could have come from John Miletta and did not come from Keith Stanley.”
It is well established that expert testimony is admissible where the expert has knowledge or experience not common to a layman which renders his opinion an aid to the jury in making its determination regarding the facts in issue. (People v. Jordan (1984),
Additionally, we note the evidence showed defendant had a motive for the murder as the victim had discovered that defendant forged some of his checks. Defendant’s fingerprints were found in dried blood on the mop used to strike the victim’s head. Defendant had threatened to kill the victim prior to the murder and admitted to Madison that he left his mark on Springfield before leaving town the day after the murder. Accordingly, even if the frequency calculations should have been excluded, the error was harmless since the evidence of defendant’s guilt was overwhelming. People v. Redman (1985),
Defendant also argues the conviction for aggravated battery should be vacated as an included offense of first degree murder. In determining whether an offense is an included offense of another, the courts often look to the statutory definition of each offense, or to the manner in which the offenses are charged. (People v. Mays (1982),
People v. King (1977),
Included offense means an offense which is established by proof of the same or less than all of the facts or a less culpable mental state (or both), than that required to establish the commission of the offense charged. (Ill. Rev. Stat. 1989, ch. 38, par. 2 — 9(a).) The information charged that defendant “without lawful justification and with intent to kill *** stabbed [John F. Miletta] with a knife.” The aggravated battery charge alleged that defendant “without legal justification intentionally caused great bodily harm to [John F. Miletta], in that he stabbed [John F. Miletta] with a knife.” As charged here, aggravated battery is a lesser included offense of murder. (People v. Lyons (1974),
Next, defendant argues that defense counsel’s failure to present mitigating evidence at sentencing constituted ineffective assistance of counsel. At sentencing, defense counsel did not offer evidence in mitigation and the trial court subsequently imposed a sentence of 95 years' imprisonment. Defendant contends the presentence investigation report suggested important information regarding defendant’s family. According to the presentence report, defendant stated he was “very close to his mother,” but that “he grew up afraid of his father, due to physical abuse inflicted upon him by his father.” Defendant maintains that the two compelling sources of potential mitigating evidence defense counsel should have investigated were that defendant was abused as a child and that defendant retained a close relationship with his mother and his siblings.
Sentencing is a critical stage in the criminal proceeding at which defendant is entitled to effective assistance of counsel. (People v. Reyes (1981),
Here, there is nothing in the record indicating trial counsel failed to properly investigate potential mitigating evidence. The situation is not comparable to Perez, cited by defendant, where a post-conviction evidentiary hearing was held regarding defense counsel’s performance and the existence of potential mitigating evidence. (See People v. Williams (1991),
Accordingly, defendant’s conviction and sentence for murder is affirmed, and the conviction and sentence for aggravated battery is vacated.
Affirmed in part; vacated in part.
STEIGMANN, P.J., and GREEN, J., concur.
