Sledgehammer

Columbo explains to his assistant how he has broken the criminal's unbreakable alibi with a sledgehammer.

Columbo goes to Vivian's office and offers his condolences for the death of her husband. Vivian expresses a desire to meet his wife.

Columbo questions Mr. Connolly. He also visits Vivian at her home, and she offers him lemon marmalade. He hates marmalade, but his wife loves it.