Thesp William Boyett died Dec. 29 in Los Angeles of complications from pneumonia and kidney failure. He was 77.

Boyett’s 50-year career spanned television, radio, theater and film, and he was best known for his role as Sgt. MacDonald on the TV series “Adam-12” from 1968 to 1975.

Boyett’s first recurring role was on the television series “Highway Patrol” with Broderick Crawford. He was also a frequent guest star on “Dragnet,” “Family Affair,” “My Three Sons,” “Emergency!” and “Knots Landing.” Boyett also appeared on “General Hospital.”

Born Harry William Boyett in Akron, Ohio, Boyett was raised in Waco, Texas, before moving to Los Angeles. He graduated from the University of Southern California, where he studied radio and television. Boyett went onto to serve with the U.S. Navy in Guam.

His voice was frequently heard in national commercials and voice-over work. Boyett appeared in films including “The Hidden,” “How the West Was Won,” “The Rocketeer” and “Strays.”

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Boyett is survived by his wife, Jane; a son; a daughter; two granddaughters; and two brothers. Donations may be made to the Motion Picture and Television Fund and the Music Center Education Division.