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LOS ANGELES, Calif. (March 4, 2016) – A construction worker found a blood-stained knife buried on O.J. Simpson’s home “years ago,” but the discovery is just now coming to light as part of a “top secret” investigation.

According to TMZ, the construction worker found the folding buck knife when the home was demolished. The knife then went to an off-duty officer who kept it in his home for years before turning it over to police.

The report said the knife is now being tested for DNA and other evidence after it was handed over to the Los Angeles Police Department’s Robbery Homicide Division in January.

A source told TMZ that the knife appeared to have blood residue on it, but without testing it’s impossible to know because of the age and amount of rust stains.

In late January, the now retired traffic cop who had the knife contacted a friend at LAPD and asked for the case number for the Nicole Brown/Ronald Goldman murder case. He planned to frame the knife and engrave the case number on the frame, the report said. The retired officer turned it over as “outraged” brass at LAPD demanded he do so.

Simpson, the former football and movie star, was charged with murder in connection with the  June 1994 fatal stabbings of Nicole Brown Simpson and Ronald Goldman. What followed was the so-called “Trial of the Century” in which Simpson was acquitted in October 1995.

According to TMZ, the murder case is still considered an open investigation since Simpson was found not guilty. However, he couldn’t be prosecuted in the case because of double jeopardy.