The Police Department put out a release Friday saying detectives conducted an exhaustive investigation that included reviewing financial documents, thousands of emails and texts as well following up on many tips.

Police are confident after reviewing all the evidence that Harold Martin Smith acted alone in gunning down Chasen as she drove her Mercedes-Benz through Beverly Hills following the movie premiere of “Burlesque.”

The 43-year-old career criminal killed himself Dec. 1 when police arrived at a Hollywood apartment building to question him about the shooting.

Police say the gun used to kill Chasen was the same weapon Smith used to commit suicide.