Randall and Hopkirk (Deceased) - Season 1 - Eps 10: When did You Start to Stop Seeing Things?
Jeff is hired by a company to find out who is leaking information in the stock market. Finding Jeff suspiciously out of character — and also now being unable to see him — Marty finds out that the real Jeff has been captured and that the fake Jeff is an impostor, using his status to conduct murders of financial personnel. Marty uses a hypnotist to save the day.
About Randall and Hopkirk (Deceased)

Title: Randall and Hopkirk (Deceased)
First Air Date: 1969-09-21
Last Air Date: 1970-03-13
Status: Ended
Rating: 7/10 (from 17 votes)
Language: EN
Seasons: 1
Total Episodes: 26
Network: ITV1
Genres: Comedy, Sci-Fi & Fantasy, Crime
Production Companies: Unknown
Synopsis
Randall and Hopkirk (Deceased) is a British private detective television series. In the initial episode Hopkirk is murdered during an investigation, but returns as a ghost. Randall is the only main character able to see or hear him, although certain minor characters are also able to do so in various circumstances throughout the series.
Cast

Annette Andre
Jeannie Hopkirk

Kenneth Cope
Marty Hopkirk

Mike Pratt
Jeff Randall

Martin Wimbush
Head Waiter