Mike Connors, the star of the long-running television series “Mannix,” passed away Thursday afternoon at the age of 91. Connor’s son-in-law, Mike Condon, revealed that Connors died due to complications from pneumonia, which had been diagnosed a week earlier.

Connors’ most well-known work was that of private detective Joe Mannix on the CBS television series “Mannix,” which ran from 1967 to 1975. The show was known for its tough-guy lead, who ran an independent private detective firm and ended most episodes by getting in brawls with criminals.

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Connors also starred in “The Ten Commandments” and a remake of “Stagecoach.” His first film role was 1952’s “Sudden Fear.” His last credited screen appearance was a 2007 guest spot on “Two and a Half Men.”

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The actor was a military man: He served in the Air Force during World War II and after two years at law school decided he wanted to try his hand at being a leading man. Famous for his square jaw and commanding screen presence, he more than succeeded.

Connors was also known for his work in combating the stigma of mental illness. His son was diagnosed with schizophrenia before his death.

The actor is survived by his wife, daughter, son-in-law, and granddaughter. It’s not been a good week for Hollywood and the entertainment world: Other entertainers to have passed this week include Mary Tyler Moore and Butch Trucks, the well-known drummer with the Allman Brothers Band.