After forensic testing was conducted on a knife that was reportedly discovered by a construction worker years ago on property once owned by the former football player, the Los Angeles Police Department confirmed on Friday that it has determined the knife is not connected to the 1994 murders of Simpson's ex-wife, Nicole Brown Simpson, and her friend Ronald Goldman.
A law enforcement source tells ET, "They tested [the knife]. No blood found on it, it was not the correct size and the blade wasn't serrated. [Nicole and Rob] were killed with a long serrated knife."
The LAPD Media Relations Section also tweeted, "#LAPD has determined knife has no nexus to Simpson/Goldman murder investigation. The investigation remains open."
The discovery of the knife's existence last month was coupled with an already re-awakened public interest in the controversial case, as the docudrama The People vs. O.J. Simpson: An American Crime Story had begun airing on FX.
Former attorney Marcia Clark -- who served as the head prosecutor in the Simpson case -- talked exclusively to ET in March about the possible bombshell discovery of the knife.
"I really don't know what to think of it," Clark said at the time.. "I can't believe someone gave a police officer what appears to be, could be, important evidence in a case -- even if it is closed -- and takes it home. I don't know what to say about that except I can't believe it, but it's apparently what happened."
"I don't know whether to say it is truly evidence, none of us knows that yet -- it might be a hoax, it might be somebody who planted it and then just pretended to find it and gave it to the off-duty police officer, you don't know," she continued. "But, of course, I'm glad the LAPD is taking it seriously and subjecting it to testing so we can find out."