Police are reportedly investigating newly uncovered evidence in the O.J. Simpson murder case

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LAPD Reveals Details About Knife Found At O.J. Simpson's Property

New evidence, lost for nearly two decades, has reportedly resurfaced and may shed light on the O.J. Simpson murder case.

TMZ reports that a construction worker found a buried knife in the yard of O.J. Simpson's former estate as long ago as 1998.

The worker reportedly turned the weapon, a folding buck knife, over to a nearby off-duty Los Angeles Police Department officer, who was working as security for a movie shoot across the street.

But instead of turning the weapon into police investigators, the officer allegedly brought it home and kept it for years.

In January, the police officer, now retired, reportedly told his friend, an officer in the LAPD's Robbery Home Division, about the knife and his plans to frame it for his wall. He then allegedly asked if the RHD officer could get the departmental record number for the 1994 Nicole Brown Simpson/Ronald Goldman murder case, which he wanted to engrave into the frame.

TMZ's sources said the RHD officer was irate that his friend had kept the knife this long and informed his superiors, who commanded the retired officer to turn in the knife.

Key players in O.J. Simpson trial:

17 PHOTOS
Key Players in the OJ Simpson Trial
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Police are reportedly investigating newly uncovered evidence in the O.J. Simpson murder case
FILE - In this Wednesday, June 21, 1995 file photo, O.J. Simpson holds up his hands before the jury after putting on a new pair of gloves similar to the infamous bloody gloves during his double-murder trial in Los Angeles. The return of O.J. Simpson to a Las Vegas courtroom next Monday, May, 13, will remind Americans of a tragedy that became a national obsession and in the process changed the country's attitude toward the justice system, the media and celebrity. (AP Photo/Vince Bucci, Pool, File)
Defense attorney Robert Shapiro (L) sits next to O.J. Simpson during a preliminary hearing following the murders of Simpson's ex-wife Nicole Brown Simpson and her friend Ronald Goldman July 7, 1994 in Los Angeles. (Photo by Lee Celano/WireImage)
Johnnie Cochran Jr., left, and Gerald Uelmen leave the Criminal Courts Building following the arraignment of O.J. Simpson on murder charges Friday, July 22, 1994, in Los Angeles. Cochran, who is a high-profile attorney known for his trials kills and links to the city's African-American community, is the latest addition to Simpson's defense team, which also includes Uelmen. (AP Photo/Chris Martinez)
LOS ANGELES, CA - FEBRUARY 27: Prosecutor Marcia Clark complains to the judge 27 February about a second statement by Rosa Lopez, a key defense witness, that was not released by the defense. Lopez, a housekeeper to a neighbor of O.J. Simpson's, claims to have seen a white Ford Bronco outside his home at around the time the prosecution claim the murders of Nicole Brown Simpson and Ron Goldman took place. AFP PHOTO (Photo credit should read POO/AFP/Getty Images)
Witness Brian "Kato" Kaelin testifies under direct examination during the O.J. Simpson double-murder trial at the Los Angeles Criminal Courts Building in this Tuesday, March 21, 1995 photo. (AP Photo/John McCoy, Pool)
FILE - This file photo combo shows O.J. Simpson's ex-wife Nicole Brown Simpson, left, and her friend Ron Goldman, both of whom were murdered and found dead in Los Angeles on June 12, 1994. O.J. Simpson was arrested in connection to the murder and acquitted of the crime. Simpson is now serving nine to 33 years in a Nevada prison after a jury found him guilty in 2008 of leading the gunpoint robbery of two sports memorabilia dealers in Las Vegas, and he's seeking a new trial because he says his longtime lawyer failed to disclose that he knew about the plan in advance and told Simpson it was legal and provided bad advice at trial. (AP Photo/File)
FILE--Los Angeles Police Detective Mark Fuhrman testifies in the Simpson double-murder trial in Los Angeles Thursday, March 9, 1995. The calm, controlled voice of Mark Fuhrman sliced through the O.J. Simpson courtroom Tuesday on racially explosive tapes offered by the defense to unmask the detective as ``L.A.'s worst nightmare,'' a racist, lying policeman. It was the same voice jurors heard months ago when the investigator who found the bloody glove on Simpson's property swore under oath that he had not used the word ``nigger'' in the last 10 years. (AP Photo/Pool, Kim Kulish)
Los Angeles Police Department Det. Philip Vannatter denied lying to the jury in the O.J. Simpson trial when he testified that he didn't consider Simpson a suspect when investigators entered his estate without a warrant Tuesday, Sept. 19, 1995, at Simpson's double-murrder trial in Los Angeles. (AP Photo/John McCoy, Pool)
Los Angeles Police Department criminalist Dennis Fung, right, arrives with Brown family attorney, John Kelly, at the Los Angeles County Superior Court in Santa Monica, Calif. on Tuesday, Nov. 5, 1996 for the wrongful-death civil case against O.J. Simpson. Fung was on the stand on Tuesday. (AP Photo/Michael Caulfield)
Potential O.J. Simpson alibi witness Rosa Lopez testifies in Los Angeles Superior Court Thursday, March 2, 1995, without the jury present during Simpson's double-murder trial. The woman billed in Johnnie Cochran Jr.'s opening statement as the Maid With the Alibi came to court in late February, testified under protest, hopped on a plane to El Salvador and hasn't been heard from since. (AP Photo/Blake Sell, Pool)
Limousine driver Allan Park, left, testifies while attorney Johnnie Cochran Jr. displays a bag during the O.J. Simpson double-murder trial in Los Angeles Wednesday, March 29, 1995. (AP Photo/Hal Garb, Pool)
Prosecutor Christopher Darden points at a chart during his closing arguments as Marcia Clark looks on, Friday, Sept. 29, 1995, in a Los Angeles courtroom during the O.J. Simpson double-murder trial. Darden said to the jurors ``It's time to stand up. It is time to stand up. The Constitution says a man has no right to kill and get away with it just because one of the investigating officers is a racist.'' (AP Photo/Reed Saxon, pool)
LOS ANGELES, CA - JUNE 19: O.J. Simpson (R) whispers to Defense attorney F. Lee Bailey (L) during testimony of FBI special agent William Bodziak 19 June during the O.J. Simpson murder trial in Los Angeles. Bodziak compared one of O.J. Simpson's tennis shoes to a model of the Italian-made Bruno Magli shoes, which left imprints at the murder scene of Nicole Brown Simpson and Ronald Goldman. AFP PHOTO (Photo credit should read POO/AFP/Getty Images)
LOS ANGELES, CA - JUNE 16: O.J. Simpson defense attorney Alan Dershowitz (standing) gestures during a motion to Judge Lance Ito 16 June in which he said that the standard of juror dismissals must be changed. The defense has accused the prosecution of juror targeting and hiding witnesses. Seated are (L-R) prosecutor Marcia Clark and Scott Gordon. AFP PHOTO (Photo credit should read POO/AFP/Getty Images)
Defense attorney Barry Scheck, right, continues his cross- examination of Los Angeles Police criminalist Collin Yamauchi, Friday, May 26, 1995, during the O.J. Simpson double-murder trial in Los Angeles. (AP Photo/Kevork Djansezian, Pool)
Los Angeles Superior Court Judge Lance Ito yells in court during the O.J. Simpson double-murder trial in Los Angeles Friday, Sept. 29, 1995. (AP Photo/Eric Draper, Pool)
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Another source with knowledge of the investigation told TMZ that police saw possible blood residue on the knife, though it's hard to discern due to rust and stains.

An investigation testing the evidence is reportedly being kept top secret.

An LAPD spokeswoman told Business Insider that there's no comment on the report at this time.

O.J. was tried for the murders of Nicole Brown Simpson and Ronald Goldman and found not guilty by a jury in 1995.

Since no one has been convicted to date, the case remains open. If the knife does connect O.J. to the murders, he can't be tried again due to double-jeopardy laws.

In a 1997 civil suit by the victims' families, O.J. was found liable for Nicole and Goldman's deaths in a $33.5 million judgment.

Currently, O.J. is serving prison time for armed robbery at a Las Vegas hotel.

Photos from the O.J. Simpson car chase:

12 PHOTOS
OJ Simpson car chase, June 17 1994
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Police are reportedly investigating newly uncovered evidence in the O.J. Simpson murder case
LOS ANGELES - JUNE 17: Police cars pursue the Ford Bronco driven by Al Cowlings, carrying fugitive murder suspect O.J. Simpson, on a 90-minute slow-speed car chase June 17, 1994 on the 405 freeway in Los Angeles, California. Simpson's friend Cowlings eventually drove Simpson home, with Simpson ducked under the back passenger seat, to Brentwood where he surrendered after a stand-off with police. (Photo by Vinnie Zuffante/Archive Photos/Getty Images)
LOS ANGELES - JUNE 17: Motorists wave as police cars pursue the Ford Bronco (white, R) driven by Al Cowlings, carrying fugitive murder suspect O.J. Simpson, on a 90-minute slow-speed car chase June 17, 1994 on the 405 freeway in Los Angeles, California. Simpson's friend Cowlings eventually drove Simpson home, with Simpson ducked under the back passenger seat, to Brentwood where he surrendered after a stand-off with police. (Photo by Jean-Marc Giboux/Liaison)
LOS ANGELES - JUNE 17: Motorists wave signs as police cars pursue the Ford Bronco driven by Al Cowlings, carrying fugitive murder suspect O.J. Simpson, on a 90-minute slow-speed car chase June 17, 1994 on the 405 freeway in Los Angeles, California. Simpson's friend Cowlings eventually drove Simpson home, with Simpson ducked under the back passenger seat, to Brentwood where he surrendered after a stand-off with police. (Photo by Vinnie Zuffante/Archive Photos/Getty Images)
LOS ANGELES - JUNE 17: Motorists wave as police cars pursue the Ford Bronco (white, R) driven by Al Cowlings, carrying fugitive murder suspect O.J. Simpson, on a 90-minute slow-speed car chase June 17, 1994 on the 405 freeway in Los Angeles, California. Simpson's friend Cowlings eventually drove Simpson home, with Simpson ducked under the back passenger seat, to Brentwood where he surrendered after a stand-off with police. (Photo credit should read MIKE NELSON/AFP/Getty Images)
LOS ANGELES - JUNE 17: Motorists stop and wave as police cars pursue the Ford Bronco (white, R) driven by Al Cowlings, carrying fugitive murder suspect O.J. Simpson, on a 90-minute slow-speed car chase June 17, 1994 on the 405 freeway in Los Angeles, California. Simpson's friend Cowlings eventually drove Simpson home, with Simpson ducked under the back passenger seat, to Brentwood where he surrendered after a stand-off with police. (Photo by Jean-Marc Giboux/Liaison)
LOS ANGELES, CA - JUNE 18: Ex-football superstar O.J. Simpson (C) is accompanied by two LAPD detectives to Parker Center after he was arrested following a 90 minute highway chase 17 June. Simpson has been charged with the murder of his ex-wife Nicole Simpson and her friend Ronald Goldman who were brutally slain late 12 June 1994. (Photo credit should read VINCE BUCCI/AFP/Getty Images)
LOS ANGELES, UNITED STATES: A photograph dated 29 September 1994 of O.J. Simpson in a Los Angeles courthouse during his trial. (Photo credit should read MIKE NELSON/AFP/Getty Images)
FILE - This file photo combo shows O.J. Simpson's ex-wife Nicole Brown Simpson, left, and her friend Ron Goldman, both of whom were murdered and found dead in Los Angeles on June 12, 1994. O.J. Simpson was arrested in connection to the murder and acquitted of the crime. Simpson is now serving nine to 33 years in a Nevada prison after a jury found him guilty in 2008 of leading the gunpoint robbery of two sports memorabilia dealers in Las Vegas, and he's seeking a new trial because he says his longtime lawyer failed to disclose that he knew about the plan in advance and told Simpson it was legal and provided bad advice at trial. (AP Photo/File)
LOS ANGELES, CA - MARCH 6: Los Angeles Police Detective Tom Lange (L) points to pictures 06 March of the trail of blood at Nicole Brown Simpson's condominium where she and her friend Ron Goldman were murdered 12 June 1994 during testimony in the O.J. Simpson murder trial. Lange, one of the lead investigators in the case, was cross-examined by the defense as to his actions at the murder scene. On the right is Simpson attorney Johnnie Cochran, Jr. AFP PHOTO (Photo credit should read Lori SHELPER/AFP/Getty Images)
LOS ANGELES, CA - JANUARY 24: Prosecutor Marcia Clark points to a chart as she describes to jurors where evidence was found at O.J. Simpson's home during opening statements in the O.J. Simpson murder trial 24 January in Los Angeles, CA. Simpson is accused of the 12 June 1994 murders of his ex-wife Nicole Brown and Ronald Goldman. (COLOR KEY: Chart has blue border) AFP PHOTO (Photo credit should read POO/AFP/Getty Images)
LOS ANGELES, CA - FEBRUARY 8: Sukru Boztepe points 08 February in a Los Angeles court to O.J. Simpson ex-wife Nicole Brown Simpson's condominium where he found her body 'lying down full of blood' just after midnight 12 June 1994. A friend, Ronald Goldman, was also found murdered. (COLOR KEY: Boztepe's shirt is red). AFP PHOTO (Photo credit should read POO/AFP/Getty Images)
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