Ironside/Death by the Numbers
After a couple of fatal 'accidents' claim members of the parole board, Ironside poses as the next possible victim.
Raymond Burr plays a dual role in this episode: in addition to playing Chief Ironside, he also plays Carleton Duffy, a grouchy old man who's a member of the parole board. Ironside poses as Duffy to catch the killer. Interestingly, Burr as Duffy looks exactly like Burr did in the Perry Mason movies of the late '80s and early '90s, with all grey hair and a grey beard.