6x15 - Quincy, M.E.

A club near Danny's burns down killing the owner, Lou Chesler. His wife, Elizabeth, is suspected of causing her husband's death, especially by an insurance investigator for the company that held her husbands' life assurance policy. He thinks she has also killed previous men in her life and warns the latest one that he could be next. The latest one is, of course, Quincy.