He was found dead of natural causes at his home in the Brentwood area of Los Angeles yesterday, Los Angeles police officer Alonzo Iniquez said early today.
Police responded to a call around 8 pm PDT and confirmed Garner's identity from family members, Iniquez told The Associated Press.
There was no immediate word on a more specific cause of death. Garner had suffered a stroke in May 2008, just weeks after his 80th birthday.
His quick-witted avoidance of conflict provided a refreshingly new take on the American hero, contrasting with the steely heroics of John Wayne and the fast trigger of Clint Eastwood.
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Well into his 70s, the handsome Oklahoman remained active in both TV and film. In 2002, he was Sandra Bullock's father in the film "Divine Secrets of the Ya-Ya Sisterhood."
The following year, he joined the cast of "8 Simple Rules ... For Dating My Teenage Daughter," playing the grandfather on the sitcom after star John Ritter, who played the father, died during the show's second season.
But in his 2011 memoir, "The Garner Files," he provided some amusing and enlightening clues, including his penchant for bluntly expressed opinions and a practice for decking people who said something nasty to his face including an obnoxious fan and an abusive stepmother. They all deserved it, Garner declared in his book.
It was in 1957 when the ABC network, desperate to compete on ratings-rich Sunday night, scheduled "Maverick" against CBS's powerhouse "The Ed Sullivan Show" and NBC's "The Steve Allen Show." ''Maverick" soon outpolled them both.