Diagnosis Murder/The Last Laugh (2)
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The Last Laugh (2) is the tenth episode of the second season of Diagnosis Murder, and the twenty-ninth episode overall.
Special Guest Star: Dyan Cannon (Bonnie Valin)
Guest Stars: Stephen Root (Charlie Lane), Matthew Glave (Roger Valin), Crystal Chappell (Eve Laurie), Harley Venton (Dr. Lloyd Fleming), Jack Blessing (Special Agent Matthew Dickerson), David Cromwell (Wallace Sterling), Robin Sachs (John Smith/ Painting Thief), Edward Conery (Peter the Artist), Lenny Wolpe (Nathan Keys)
Mark suspects that Bonnie Valin is the killer of her husband and sets out to prove it.