When did Glenn Strange join Gunsmoke?

Strange started playing Sam the bartender on Gunsmoke in 1961 but he still acted one last time in The Rifleman in 1962.

When did Glenn Strange leave Gunsmoke?

Strange played the role of Sam Noonan from 1961 until shortly before his death in 1973.

How many seasons was Glenn Strange on Gunsmoke?

Among other TV roles, he capped off his career with a steady (12 years) role as Sam the bartender on the classic Gunsmoke (1955) series from 1962 until shortly before his death from lung cancer in 1973.