Drowning by Numbers 4K 1988

Three women with the same name, Sissy Colpitts, decide to drown the husbands they're fed up with. They know full well they'll get away with it. The medical examiner, who is in love with all three of them, will gladly write them accidental death certificates.
But, bound by a promise of silence, he finds himself in a "deep puddle" when witnesses to the murders begin to "surface"....