Detectives have concluded a knife found at the former estate of OJ Simpson was not the murder weapon used to kill his ex-wife Nicole Brown Simpson and her friend Ronald Goldman.
Los Angeles Police Captain Andy Neiman said investigators had ruled out the knife after weeks of forensic investigation.
Simpson was acquitted of stabbing to death his wife and Mr Goldman outside her home on June 12 1994.
A knife linked to the killings has never been found.
Police revealed last month they were testing one a construction worker said he found on Simpson's property 12 or 13 years ago and passed on to a retired police officer.
Police say they only recently learned that the officer, now retired, still had the knife.