O.J. Simpson
Los Angeles Police are currently testing a knife found buried outside the former home of O.J. Simpson, photographed above in a Las Vegas court May 17, 2013. Getty Images

It's been years since O.J. Simpson stood trial for the alleged murder of wife Nicole Brown Simpson and her friend, Ron Goldman, but it seems the investigation is not yet over.

Los Angeles Police are currently looking into a knife found buried at the former Cleveland Browns player's Brentwood, California, home. TMZ reports that the knife was found several years ago by a construction worker who gave it to an off-duty police officer. The officer reportedly framed the knife and kept it on display for several years. LAPD reportedly found out about his withholding of evidence recently and forced him to bring it in. His undoing, according to reports, came when the retired officer requested the case number for the files regarding Brown-Simpson and Goldman's murders. He is said to have been planning to engrave the number on the knife. It is now in police possession and is being tested.

O.J.'s Brentwood, California, mansion was demolished in 1998. The LAPD confirmed to the New York Daily News that the weapon was found during demolition. It provided no further information about the investigation.

Brown-Simpson and Goldman were murdered in June 1994. Both bodies were found outside her condo, also located in Brentwood. No murder weapon was ever recovered; however, both victims suffered multiple stab wounds. The Chicago Tribune published details from the coroner's report revealing Brown-Simpson was stabbed four times in the neck before having her throat slit. Similarly, Goldman was stabbed in the neck, as well as his chest, abdomen and left thigh. The assailant was thought to be right-handed and carried out the attack with either a single or double-edged knife "about 6 inches long."

Simpson, now 68, took the stand for the first time in October 1995. The case lasted 134 days before he was acquitted, thanks largely to an ill-fitting leather glove. The trial is getting the Hollywood treatment and is currently playing out on FX's mini-series "The People v. O.J. Simpson: American Crime Story."

Little additional information is known at this time. The Hollywood Reporter, however, has confirmed that LAPD is looking deeper into the knife's origins.