Neighbor: Suspect in Ronni Chasen's Murder Was 'Like a Loose Cannon'

Plus, Chasen’s brother, Larry, downplays Hollywood speculation about why she was murdered.

The "person of interest" in Ronni Chasen's murder -- who killed himself Wednesday as police served a search warrant -- was deeply troubled, according to a neighbor at his seedy Hollywood apartment complex.

"He was like a loose screw -- a loose cannon waiting to blow," neighbor Terri Gilpin told the New York Post.

The man -- whose full name is Harold Martin Smith, according to TMZ; cops have yet to identify him -- spent a stretch in prison on drug and weapon convictions.

"He told me several times, 'If it ever came back to me going to prison, I would die first,'" Terri’s husband, Brandon, told the Los Angeles Times.

Harold was bragging about murdering the longtime Hollywood publicist, according to neighbors.

"He said he was expecting a big pile of money to come in," said Terri. ""Then Brandon said, 'Well, what are you getting money for?' and he said, 'The publicist on TV -- I'm getting $10,000… He said just, 'That publicist on TV -- I did it. I did it,'" Terri told the New York Post.

America's Most Wanted host John Walsh told the L.A. Times Thursday that a tip from his Fox show led police to the person of interest.

Police said the suicide was captured on surveillance video, which they were reviewing Thursday night.

While The Hollywood Reporter has confirmed police have a working theory that the murder was planned, Ronni's brother, Larry Cohen, downplays rumors that it was in retaliation for some type of gambling debt.

"I don't play poker. I don't gamble. My two daughters don't gamble. Someone writes something on the Internet and it's everywhere, whether it's true or not," Cohen told entertainment blog Showbiz411. "I'm sure it was road rage. I'm sure it was some kind of random thing."

Chasen left a 1994 will that valued her estate at $6.1 million, reported Thursday.