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Ronni Chasen

Eric Charbonneau/Getty Images

The Hollywood screenwriter and brother of the late Ronni Chasen is sharing his theory on what happened the night his sister was murdered.

It seems that Chasen's brother, Larry Cohen (Phone Booth, Cellular), is on the same page as the Beverly Hills Police Department when it comes to whether Harold Smith is to blame.

Smith, who killed himself during the investigation, was the "person of interest," but Cohen along with the BHPD are not convinced he had anything to do with it.

"This guy was a deranged person who just made that up; no way he was involved," Cohen told the New York Times.

And they just might be on to something.

Fox News reports that police tested the gun Smith used for his suicide, and it turns out that the bullets did not match the weapon used for Chasen's murder.

So then what does Cohen think happened?

"I still think this was most likely a case of road rage."

Beverly Hills PD is still investigating the case.