Aka, John Day - he was a stunt man, stunt coordinator, and actor, mostly in smaller roles, though he was the lead in the 1946 B-movie, Detour to Danger.
Bonanza
The Fugitive
Wagon Train
Cheyenne
Adam-12
Have Gun, Will Travel
The Rockford Files
The Beverly Hillbillies
The Virginian
Maverick
The Lone Ranger
Gunsmoke
The Untouchables