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

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:

18 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
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)
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)
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)
Deputy District Attorney Christopher Darden, one of the prosecutors in the OJ Simpson murder trial is shown during a court hearing December 9
OJ Simpson sits in court October 14 with his attorney Robert Shapiro during a hearing in Simpson's murder trial
Defense attorneys Robert Shapiro (L) and Johnnie Cochran, Jr., arrive at the Criminal Courts Building in Los Angeles September 26 for the first day of jury selection in the OJ Simpson murder trial. A protestor's painting on spousal abuse is in the background
Superior Court Judge Lance Ito makes a point during a pre-trial hearing on suppression of evidence in the OJ Simpson murder case September 21 in Los Angeles
Josephine Guarin, housekeeper at OJ Simpson's estate in the Brentwood section of Los Angeles, testifies during a pre-trial hearing on evidence suppression in the OJ Simpson murder case September 22
Prosecution witness Candace Garvey, a friend of Nicole-Brown Simpson, testifes about OJ Simpson's appearance at his daughter's dance recital June 12, 1994, during afternoon court session in OJ Simpson's murder trial
Prosecutor Marcia Clark wears rubber gloves as she places a left-hand glove found at the feet of murder victim Ronald Goldman into a plastic bag during OJ Simpson's murder trial, February 17
Denise Brown (L), sister of Nicole-Brown Simpson, cries as she testifies February 6 about Nicole-Simpson's relationship with O.J. Simpson, during morning court session in Simpson's murder trial. Brown wears "Angel" earrings and pins in memory of her sister
FILE PHOTO 16MAR95 - Los Angeles police detective Mark Fuhrman is shown on the witness stand March 16, 1995 during O.J. Simpson's murder trial in Los Angeles. A bloody fingerprint was found at the scene of the murders of Nicole Brown Simpson and Ron Goldman but police bungling destroyed it, Fuhrman says in a new book published on February 17. SIMPSON FINGERPRINT
Prosecutor Brian Kelberg points out a wound near Ronald Goldman's ear on an autopsy chart during testimony June 9 in the OJ Simpson murder trial. The Los Angeles County coroner said that Goldman received two small stabs to the neck in addition to fatal slashes, suggesting that he was taunted by his attacker before being killed
Kim Goldman, sister of murder victim Ron Goldman, reacts to the showing of a photograph of her brother's bloody shirt during the OJ Simpson double murder trial in Los Angeles June 26. The prosecution presented the final phase of its case, trace and hair evidence. **POOR QUALITY DOCUMENT
Arnelle Simpson, daughter of murder defendant OJ Simpson, testifies July 10 on her father's behalf in his double murder trial in Los Angeles. Arnelle Simpson is the first witness in the defense's case
Defense witness Robert Heidstra points during his testimony July 12 at O.J. Simpson's murder trial to the area near where he walked his dog on the night [Nicole Simpson and Ronald Goldman] were murdered June 12,1994. The chart is a map of the area around Bundy Drive, site of the murders
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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:

11 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)
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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