Los Angeles police are currently investigating a knife that was discovered years ago on O.J. Simpson’s former estate, Variety has confirmed.

The Robbery-Homicide Division is testing the buck knife to determine whether it has any connection with the 1994 murders of Simpson’s ex-wife, Nicole Brown Simpson, and her friend Ron Goldman. Simpson was acquitted of the stabbings in 1995 after a trial — dubbed the “trial of the century” — that lasted more than eight months.

A construction worker demolishing Simpson’s Rockingham residence allegedly turned over the knife years ago to an LAPD traffic cop who was working as a security guard on a movie set (who may have been retired at the time). However, detectives reportedly only learned of the knife’s existence in the last month when the retired officer revealed that it had been in his possession all along. A detective informed superiors, who launched an investigation into where the weapon came from. TMZ first reported the news.

“We still don’t know if that’s an accurate account,” Capt. Andrew Neiman said Friday at a press conference at LAPD headquarters.

The LAPD is currently determining if the knife is actually a piece of evidence. The weapon has been submitted to a lab to test for serology, DNA and hair samples.

Neiman, who couldn’t describe the knife, said the department doesn’t know yet if the story behind the knife is “bogus from the get-go.” It could be a “facsimile or made-up story,” he said, encouraging the person who made the initial discovery to contact authorities.

The weapon used in the killings has been a mystery for two decades. Even if the knife yields DNA evidence that can be linked to Simpson, he cannot be retried due to double jeopardy. Simpson is now serving a 33-year prison sentence in Nevada after being charged in 2008 with armed robbery and kidnapping.

The former football star is the subject of the hit FX miniseries “People v. O.J. Simpson: American Crime Story,” which follows his murder trial from the perspective of the lawyers involved. Cuba Gooding, Jr. plays Simpson on the show.