Drowning by Numbers (1988)

Cissie Colpitts drowns her cheating husband and, in the ensuing cover-up, enlists the help of lonely coroner Henry Madgett, an old friend with a longstanding weakness for her charms. But when Cissie's daughter and granddaughter—both also named Cissie Colpitts—decide to resort to the same methods for solving conflicts with their own frustrating husbands, the women and their repeated appeals for help begin to wear on Madgett's conscience.