Despite a large amount of evidence, OJ Simpson was acquitted in the stabbing deaths of his ex-wife and her friend in 1995.
Police never found the murder weapon in that high-profile case, which captivated the US for more than a year.
OJ Simpson was later found legally responsible for the deaths of Nicole Simpson and Ron Goldman in a civil case.
The former football star, who is currently serving a 33-year sentence for armed robbery and kidnapping in Las Vegas, cannot be prosecuted again under US law for the murders.
LAPD had been skeptical that the weapon was tied to the Simpson and Goldman murders.
Police said at the time that the knife was a utility-type knife and was not consistent with the one used in the crime, but still ordered forensic tests.
The case recently returned to prominence with the airing of the TV mini-series American Crime Story: The People v OJ Simpson.
According to police, someone claiming to be a construction worker found the knife at OJ Simpson’s former home when it was razed in 1998.
The man gave the knife to a police officer who was working on a film set near the property.
The police officer kept it, thinking the case was closed. However, the officer, now retired, recently told a colleague about the weapon, as a result of which the current investigation was launched.
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