Story courtesy of CNN.

A knife was recovered at the former home of O.J. Simpson in Brentwood more than 20 years after the former football star was found not guilty in the killings of his ex-wife and her friend.

The time the knife was discovered and whether it is related to the 1994 deaths of Nicole Brown Simpson and her friend Ronald Goldman is not known at this time, according to Los Angeles police spokeswoman Norma Eisenman.

Related: Kim Goldman Discusses O.J. Simpson Trial, Grief And Coping In New Book

The weapon used in the stabbing deaths, described as a long, serrated knife, was never found.

At the high-profile murder trial, Allen Wattenberg, owner of Ross Cutlery store, testified that his employee sold O.J. Simpson a 15-inch stiletto knife on May 3, 1994. He said Simpson asked that the knife be sharpened.

Prosecution witness Dr. Lakshmanan Sathyavagiswaran told the jury that he believed the killings were done with a single-edged knife.

During cross-examination, however, the doctor said he could not be positive.

Simpson was found not guilty in the two killings on October 3, 1995.

Testimony in the trial took about nine months, encompassing about 120 witnesses, 45,000 pages of evidence and 1,100 exhibits.

In September 2007, Simpson was arrested in connection with a robbery at a Las Vegas hotel room. The ex-athlete said at the time he was retrieving personal items that had been stolen from him and were being sold as memorabilia.

He was booked him on six counts of robbery, assault, burglary and conspiracy.

In October 2008, Simpson was found guilty on 12 counts, including kidnapping and armed robbery. He later was sentenced to at least 33 years in jail, with parole eligibility after nine years.