O.J. Simpson was acquitted in the stabbing deaths of ex-wife Nicole Brown Simpson and her friend Ronald Goldman 20 years ago, but a knife allegedly found on the athlete’s former property has peaked new interest in the case.

One month after FX’s premiere of “The People v. O.J. Simpson,” a dramatic retelling of the Simpson trial, Los Angeles police announced Friday a knife was found at Simpson’s former home in Brentwood, California. Authorities learned of the knife’s existence last month when a retired cop in possession of the weapon asked a fellow officer for records from the case, the NY Daily News reported. It is unknown when exactly the knife was discovered. As police investigate and test the knife, take a look back at the weapon in the O.J. Simpson trial.

GettyImages-513724480 LAPD Sgt. Marache responds to questions from the media about a knife allegedly found on O.J. Simpson's former property following a press conference in front of the Los Angeles Police headquarters, March 4, 2016. Photo: Getty Images

Brown Simpson and Goldman were killed in June 1994 in Los Angeles. Simpson was arrested and charged with murder several days later — after his infamous Ford Bronco slow-speed chase — and pleaded “absolutely 100 percent not guilty.” He was acquitted of the crimes in October 1995. While a murder weapon was never found, medical examiners determined Nicole Brown Simpson was stabbed multiple times in the head and neck, and had defensive wounds on her hands.

During an appearance in court in June 1995, chief medical examiner Dr. Lakshmanan Sathyavagiswaran, who did not perform the autopsy, told a jury Brown Simpson’s killer held her while stabbing her four times in the neck. Sathyavagiswaran said a bruise on the right side of her head appeared to be caused by a “fist of knife handle,” which most likely left her unconscious before the assailant delivered the large neck wound that killed her.

RTXFBTT A German-made 15-inch knife similar to one apparently sold to O.J. Simpson was shown during a hearing in the killings of Nicole Brown Simpson and Ronald Goldman at the Criminal Courts Building in Los Angeles, June 30, 1994. Photo: Reuters

The weapon was believed to be “one single-edged knife about six inches long,” Sathyavagiswaran said. “My opinion is that they were all three [stabs] caused by a single-edged knife, and that is each of the wounds have a blunt end and a sharp end,” he testified.

It was also revealed Ross Cutlery store owner Allen Wattenberg and employee Jose Camacho testified Simpson bought a knife from them roughly six weeks before the killings. Camacho said the athlete had purchased a 15-inch Stiletto knife, similar to the one pictured above.

GettyImages-168890090 A knife was allegedly found at O.J. Simpson's former home in Brentwood, California, home. Pictured: Simpson appears at an evidentiary hearing on May 16, 2013, in Las Vegas. Photo: Getty Images

Double jeopardy prevents Simpson, who is currently imprisoned at Lovelock Correctional Center in Nevada for unrelated crimes, from being tried again in the slayings. The Los Angeles Police Department is investigating the knife found at Simpson’s former estate.