I've always felt that Larry Hagman would have made a great murderer. He would have been coming off his role as lovable Major Tony Nelson in I Dream of Jeannie and it would have been a precursor to his role of JR Ewing on Dallas.
How about Raymond Burr?
He could have defended himself!
I'm liking the Andy Griffith and Larry Hagman ideas - too bad they weren't reality.
Fred Gwynne (Herman Munster) would have been terrific as a villain, as well. His imposing size would have been enough, but coupled with his voice and presence, he might have even been able to scare Columbo.
The same with Robert Middleton, who played the victim in Double Exposure.
James MacArthur (Danno) would have bern excellent.
C o c k s
Andy Griffth played a murderer in a Made for TV movie with Johnny Cash.