Episode 170 is Randall and Hopkirk (Deceased) 2000 

Private eyes Randall and Hopkirk are investigating two-timing husband Kenneth Crisby as Marty Hopkirk prepares for his marriage to Jeannie Hurst. Performance artist Gordon Stylus also seeks their help as he believes his wife Annette Stylus is suicidal. Marty is killed when a car, apparently driven by Annette Stylus , sweeps them both over a cliff.

Marty's ghost comes to Jeff Randall, he wants to know killed him and why.