The Los Angeles Police Department confirmed Friday that a knife that reportedly was found buried on the former estate of O.J. Simpson is under investigation.

.@LAPDHQ on knife found at O.J. Simpson's former home: We need to determine is this evidence. pic.twitter.com/Vd2UaTrizj

— Fox News (@FoxNews) March 4, 2016

.@LAPDHQ: We're not going to provide information on exact dates the knife was found. pic.twitter.com/7vFgGRI0Bd

— Fox News (@FoxNews) March 4, 2016

More from FoxSports

TMZ first reported the discovery of the knife, which was actually found in 1998 or earlier during construction at the house formerly owned by Simpson.

.@LAPDHQ says they don't know where on the property the knife was found. pic.twitter.com/W1XE5b4qgg

— Fox News (@FoxNews) March 4, 2016

.@LAPDHQ says they don't know the identity of the person who originally found the knife. pic.twitter.com/edgp6683oo

— Fox News (@FoxNews) March 4, 2016

However, the knife wasn't delivered directly to police nearly two decades ago. Instead, TMZ reports that the man who found it gave it to an off-duty police officer who decided to keep it for himself -- until the past month or so.

Simpson was found not guilty of murdering his former wife, Nicole Brown-Simpson, and her friend Ronald Goldman during a much-publicized trial in 1995.