Partners In Crime
Carole Stanwyck and Sydney Kovack were both married to the same man, a private detective. When he is killed, they both attend his memorial. When they learn how he was killed, they can't help but investigate his murder themselves. They are aided by a couple of guys who works for him, and his mother, a police lieutenant who likes Sydney.
Directors: Harry Falk, Leonard Stern
Writers: James Stark, Leonard Stern
IMDB: tt0670093