Who killed Ronni Chasen?

Little information is known about the murder of Hollywood publicist Ronni Chasen. She was gunned down on Sunset Boulevard early November 16th, just minutes after she left a star-studded party to celebrate the premiere of the movie "Burlesque," police said.

After a person of interest killed himself, the gun used in the suicide is not a match to the gun used to murder Chasen. William Bratton, former L.A. police chief and former NYC police commissioner spoke to American Morning about the mysteries of the case Monday.