A Deadly State of Mind - S4-E6
Trivia: Unusually enough for a television show devoted to a homicide detective and the way he unravels the plans of cunning murderers, the fact is that Columbo has nothing to do in this episode. Doctor Collier is seriously assaulted by Carl Donner who then goes on to violently attack his wife. Use of deadly force to prevent such an attack is allowed in the United States. Collier does not commit murder; he doesn't even commit a crime. You'd think such a hightly educated man would know enough to keep his head, call the police and explain what had happened. He wouldn't even be charged.
Suggested correction: Collier would have lost his licence to practice medicine as a result of his having a sexual relationship with a patient, and his killing the woman's husband - justified or not - would have made this much worse. For a start, the lucrative book deal he is about to sign would certainly have been cancelled. He stands to lose everything. Of course he is going to try to cover it up by any means possible, including committing another murder.
