Murder by Natural Causes 1979

An elaborate mystery involving a famous mentalist, his unfaithful wife who is trying to literally scare him to death, the best friend of the family, and the wife's ham-actor lover -- not only an intriguing who- (or whether) dunit, but also a literate, adult dramatic puzzle with an endless series of twists.

Cast:

Hal Holbrook
Arthur Sinclair 

Katharine Ross
Allison Sinclair 

Richard Anderson
George Brubaker 

Barry Bostwick
Gil Weston 

Bill Fiore
Marty Chambers 

Phil Leeds
Eddie, Private Detective