Columbo: Season 4 - 6 Episode s
4x1 - An Exercise in Fatality
September 15, 1974
A health club owner kills his partner who is about to uncover a fraud and makes it look like an accident
4x2 - Negative Reaction
October 15, 1974
Brilliant photographer Paul Galesko plans to murder his domineering wife, Frances, and pin the crime on an ex-convict named Alvin Deschler. His plan is to make it look as if Alvin kidnapped his wife and killed her before picking up the ransom money.
4x3 - By Dawn's Early Light
October 27, 1974
The head of a military school kills one of the governors by sabotaging the gun which is used on founders day.
4x4 - Troubled Waters
February 9, 1975
While holidaying on board a cruise liner, Columbo helps capture the killer of the singer with the ship's band.
4x5 - Playback
March 2, 1975
An inventor video tapes his mother-in-law's death, and then replays it back to the security guard, to give himself an alibi.
4x6 - A Deadly State of Mind
April 27, 1975
A doctor kills the husband of the woman he is having an affair with but is seen leaving the house by a witness who is happens to be blind.