Diagnosis Murder/The Last Laugh (1)
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The Last Laugh (1) is the ninth episode of the second season of Diagnosis Murder, and the twenty-eighth episode overall.
Special Guest Star: Dyan Cannon (Bonnie Valin)
and Pernell Roberts (Dr. Elliott Valin)
Co-Starring: Michael Lowry (Dave), Carey Van Dyke (Kelso), Martha Thompson (Mertle Gipe), David Kimball (Dunphy), Deena Freeman (Betsy), Patrice Pitman Quinn (Barbara), Charles Dougherty (Thurston), Peter Gonneau (Henri), Andi Chapman (Pratt), Ralph P. Martin (Driver), Mimi Cozzens (Judge), Kristin Carey (Schnitzer), Susan Nyby (Foreman)
Mark investigates the murder of a colleague, an unpopular neurosurgeon done in by laughing gas.
Carey Van Dyke, Dick's grandson and Barry's son, makes his first appearance in this episode, playing a surfer.