First and Best of All Columbo Villains
Not really a Gene Barry fan, but I give credit where it's due. With all of the many villains (and villainesses) that have matched wits with Lt. Columbo, none have surpassed the original cool, confident, calculating Dr. Fleming, although some have come very close.
Ironically, this first Columbo has one of the weakest endings. I guess you can't have everything.
Wouldn't be surprised if Barry was cast because he was also excellent in an hour long ep of Alfred Hitchcock, playing a guy who kills his wife under far different circumstances, and does his best to get away with it.