The evidence in the O.J. Simpson trial included more than 100 DNA exhibits, two blood-soaked leather gloves, rare Italian shoe prints, hair and fiber links between the crime scene and Simpson’s estate, timeline testimony placing him unaccounted for during the murder window, and a documented history of domestic violence against Nicole Brown Simpson. Prosecutors used that material to argue Simpson killed his ex-wife and her friend Ron Goldman on June 12, 1994. The defense attacked how the Los Angeles Police Department collected and handled it, and on October 3, 1995, the jury acquitted him in under four hours.
What Was Found at the Scene and at Simpson’s Estate
A neighbor discovered Nicole Brown Simpson and Ron Goldman shortly after midnight on June 13, 1994, outside Nicole’s Bundy Drive condominium in Brentwood. Nicole had been slashed across the throat with near-decapitating force. Goldman had been stabbed roughly thirty times in a small, partially enclosed walkway near the front gate.
Investigators recovered a trail of blood drops leading from the bodies toward the rear alley, bloody shoe prints tracking through the walkway, a dark leather glove soaked in blood near Goldman’s feet, and a blue knit cap. No murder weapon was ever found. Within hours, detectives went to Simpson’s Rockingham estate roughly two miles away, where they discovered a matching glove behind a guest house and blood smears on his white Ford Bronco parked in the driveway.
The DNA and Blood Evidence
DNA was the prosecution’s scientific backbone. Blood drops trailing away from the victims at Bundy were tested using Polymerase Chain Reaction, which amplifies small samples, and Restriction Fragment Length Polymorphism, which produces a more detailed profile from larger samples. Both methods pointed to Simpson. Prosecutors cited the statistical probability of a random match for the blood found on the rear gate at Bundy as approximately one in 57 billion. Additional blood on that rear gate underwent testing at three separate laboratories with no discrepancies.1U.S. Department of Justice Office of the Inspector General. A Review of the FBI Laboratory – Chapter 4
Blood turned up in multiple locations inside Simpson’s Bronco: the driver’s side door interior, the steering wheel, the center console, the instrument panel, and the driver’s side carpet. Testing on the steering wheel identified a genetic mixture consistent with both Simpson and Nicole. Blood on the center console matched Simpson through both PCR and RFLP testing. A stain on the driver’s side carpet matched Nicole.
Inside Simpson’s master bedroom, detectives recovered a pair of dark dress socks from the floor near the bed. Chemical reagents and high-intensity light sources revealed blood on the ankle area invisible to the naked eye. That blood matched Nicole’s profile. Blood on the interior of the socks matched Simpson, consistent with blood soaking through fabric while the socks were being worn.1U.S. Department of Justice Office of the Inspector General. A Review of the FBI Laboratory – Chapter 4 Together, the samples from Bundy, the Bronco, and Rockingham created a geographic chain the prosecution used to connect Simpson to both the murders and their aftermath.
The Bloody Gloves
Two Aris Isotoner leather gloves became the trial’s most infamous exhibits. One was found at the Bundy crime scene near Goldman’s body. The second was discovered behind a guest house on Simpson’s Rockingham estate by Detective Mark Fuhrman. DNA testing on the Rockingham glove revealed a mixture of blood from Simpson, Nicole, and Goldman on a single item found on Simpson’s property.
Forensic specialists also recovered hair and clothing fibers from the gloves. Hair consistent with Simpson’s was found inside. Fibers matching the carpet of his Bronco were embedded on the exterior. Fibers from Goldman’s shirt appeared on both gloves, tying the crime scene glove to the estate glove through shared trace evidence.
The Glove Demonstration
The moment that likely defined the trial came when prosecutor Christopher Darden asked Simpson to try on the bloody gloves in front of the jury. Simpson struggled visibly to pull them over his hands. Whether the gloves had shrunk from repeated soaking in blood and months of evidence storage, or whether Simpson manipulated the demonstration by splaying his fingers, remains debated. Darden later said Simpson was “a better actor than I thought he was.” Defense attorney Johnnie Cochran seized the moment in his closing argument, calling it “the defining moment in this trial” and delivering the line that became the case’s epitaph: “If it doesn’t fit, you must acquit.”
Shoe Prints, Hair, and Fibers
Bloody footprints ran through the Bundy walkway alongside the victims and trailed away toward the rear alley. FBI shoe print expert William Bodziak identified the prints as coming from a Bruno Magli “Lorenzo” style shoe, size 12, matching Simpson’s shoe size. The sole had a distinctive waffle-like tread pattern that Bodziak matched on multiple design features. Simpson denied ever owning Bruno Magli shoes.
Photographs that surfaced during the 1996 civil trial showed Simpson wearing what Bodziak identified as Bruno Magli Lorenzo shoes at a football game. Bodziak also testified in the civil trial that only 299 pairs of size 12 Lorenzos had ever been sold in the United States. No second set of shoe prints was found at Bundy, supporting the prosecution’s theory that a single attacker committed both murders.
Hair matching Simpson’s was found on Goldman’s shirt, suggesting direct physical contact during the struggle, and on the blue knit cap found near Goldman’s body. Hair matching Nicole’s appeared on the bloody Rockingham glove. Dark blue-black cotton fibers consistent with the outfit Simpson wore earlier that evening turned up on the Rockingham glove, the bedroom socks, and Goldman’s shirt. Carpet fibers matching those in Simpson’s Bronco appeared on the knit cap and the Rockingham glove. An FBI study estimated that roughly one in 3,000 vehicles in Los Angeles County had carpet fibers matching the specific type used in Simpson’s Bronco.
The Timeline
The prosecution’s timeline hinged on a window of roughly ninety minutes during which Simpson had no confirmed alibi. The murders were believed to have occurred around 10:15 p.m. based on the barking of Nicole’s dog, which neighbors began hearing around that time.
Brian “Kato” Kaelin, a friend staying in Simpson’s guest house, testified that he heard three loud thumps against the wall at approximately 10:40 to 10:45 p.m., strong enough to move a picture on the wall. Prosecutors argued this was the sound of Simpson colliding with the air conditioning unit behind the guest house while hurrying back from the murders. The Rockingham glove was later found in the narrow pathway directly behind where those thumps originated.
Limousine driver Allan Park arrived at the Rockingham estate around 10:22 p.m. to take Simpson to the airport. Park testified that he did not see the white Bronco parked on Rockingham Avenue, where it was found the next morning, and that Simpson did not respond to buzzing at the gate for nearly twenty minutes. At approximately 10:56 p.m., Park saw a large figure in dark clothing cross the driveway and enter the house. Simpson answered the intercom shortly afterward, saying he had overslept.
Domestic Violence History
The prosecution introduced Simpson’s history of violence against Nicole to establish motive. In 1989, Simpson pleaded no contest to spousal battery after police were called to the couple’s home and found Nicole with visible injuries. He received 120 hours of community service, two years’ probation, and a small fine. California law allows evidence of earlier crimes to prove motive or intent when relevant to the charged offense.2California Legislative Information. California Evidence Code 1101
The jury also heard a 911 call Nicole made in October 1993. On the recording, she told the dispatcher that Simpson had broken into her house, kicked down a door, and was screaming in the yard. “He’s going to beat the [expletive] out of me,” she said. When the dispatcher asked whether this had happened before, Nicole answered, “Many times.” Defense attorneys responded that domestic violence, however serious, did not prove murder.
How the Defense Neutralized the Evidence
The defense did not seriously dispute the DNA science itself. They attacked what happened before the samples reached the laboratory, arguing that sloppy police work and potential evidence planting made every result untrustworthy.
Collection Failures
Trainee criminalist Andrea Mazzola, who collected much of the biological evidence at Bundy, was shown on the prosecution’s own videotape failing to change her gloves between collecting different samples and placing her hand on the ground while demonstrating her technique. Separate pieces of evidence were packaged together instead of individually. Wet blood samples were sealed in plastic bags before they dried, which accelerates bacterial degradation. Police used a blanket from inside Nicole’s home to cover her body, contaminating both the body and anything around it. Each lapse opened a door for the defense to argue that DNA results could reflect cross-contamination.
The Missing Blood
A police nurse drew a reference blood sample from Simpson the day after the murders. The nurse estimated he drew about 8 milliliters, but only roughly 6 milliliters could be accounted for through laboratory records, leaving approximately 1.5 to 2 milliliters unaccounted for. The vial was not immediately entered into evidence. A detective carried it around for several hours before it was logged into the chain of custody. The defense argued this missing blood could have been used to plant evidence at the crime scene and on items recovered from Simpson’s property.
To counter the planting theory, the prosecution asked the FBI to test whether blood on the rear gate and the bedroom socks contained EDTA, a chemical preservative added to blood collection tubes. If the stains had come from the reference vial, they would contain EDTA. FBI agent Roger Martz reported that the preserved blood samples from the collection tubes contained EDTA, but the bloodstains from the rear gate and socks did not.1U.S. Department of Justice Office of the Inspector General. A Review of the FBI Laboratory – Chapter 4
Detective Mark Fuhrman
The defense saved its most damaging attack for the detective who found the Rockingham glove. Mark Fuhrman testified early in the trial and denied under oath that he had used a specific racial slur within the previous ten years. The defense later obtained audio recordings made between 1985 and 1994 by screenwriter Laura McKinny, on which Fuhrman used the slur repeatedly and described instances of police brutality against Black suspects and what he portrayed as routine evidence manipulation within the LAPD.
The tapes proved Fuhrman had committed perjury about his racial language. When recalled to the stand, Fuhrman invoked his Fifth Amendment right against self-incrimination when asked directly whether he had planted or manufactured any evidence in the case. He refused to answer. The detective who discovered the single most dramatic piece of physical evidence had been caught lying under oath and then declined to deny planting it.
The Verdict and the Civil Trial Reversal
On October 3, 1995, the jury deliberated for fewer than four hours before acquitting Simpson of both counts of murder. The defense had reframed the case from a question about DNA science into a question about whether the LAPD could be trusted to have collected and handled the evidence honestly.
The families of Nicole Brown Simpson and Ron Goldman then filed a civil wrongful death lawsuit, which concluded in February 1997 under a lower burden of proof: preponderance of the evidence rather than beyond a reasonable doubt. The jury found Simpson liable for both deaths. The Goldman family was awarded $8.5 million in compensatory damages plus $12.5 million in punitive damages, and the estate of Nicole Brown Simpson received an additional $12.5 million in punitive damages, bringing the total judgment to $33.5 million.3Justia Law. Rufo v. Simpson (2001)