This is one of the first and best Columbos, starring Robert Culp and Ray Milland. Robert Culp appeared on another Columbo, as did several other villains, including Patrick McGoohan, William Shatner, and Jack Cassidy. Ray Milland also made a later appearance.
In this one, Ray Milland is convinced his beautiful wife, played by Patricia Crowley, is having an affair, so he hires Culp to investigate. Culp has a blackmailing business on the side, so he gives Milland a fake report and threatens Crowley with the real one if she doesn't pay up. They get into a huge fight in Culp's home, and she winds up murdered. Enter Columbo.
Culp does everything he can to get Columbo off the case, including offering him a job, but Columbo is on to him from the beginning.
Excellent episode.