michael_duncun_web_.jpgLOS ANGELES — His presence was formidable, even intimidating: The former bodyguard had a muscular, 6-foot-4 frame, but it was topped by the brightest of megawatt smiles.

His gravelly baritone was well-suited to everything from animated films to action spectacles, but no matter the role, a warmth and a sweetness was always evident underneath.

The prolific character actor, whose dozens of movies included an Oscar-nominated performance as a death row inmate in The Green Mile and box office hits including Armageddon, Planet of the Apes and Kung Fu Panda, died Monday at age 54. And although he only turned to acting in his 30s, it’s clear from the outpouring of prayers and remembrances he received across the Hollywood and sports worlds that his gentle-giant persona made him much-loved during that relatively brief time.

Duncan died at Cedars-Sinai Medical Center in Los Angeles, where he was being treated for a heart attack, said his fiancée, reality TV personality Rev. Omarosa Manigault, in a statement released by publicist Joy Fehily.

Duncan “suffered a myocardial infarction on July 13 and never fully recovered,” the statement said. “Manigault is grateful for all of your prayers and asks for privacy at this time. Celebrations of his life, both private and public, will be announced at a later date.”

Tom Hanks, star of 1999’s The Green Mile — the film that earned a then-little-known Duncan a supporting-actor nomination at the Academy Awards — said he was “terribly saddened at the loss of Big Mike. He was the treasure we all discovered on the set of The Green Mile. He was magic. He was a big love of man and his passing leaves us stunned.”

Born in Chicago in 1957, Duncan was raised by a single mother whose resistance to his playing football led to his deciding he wanted to become an actor. But when his mother became ill, he dropped out of college, Alcorn State University, and worked as a ditch digger and bouncer to support her.

By his mid-20s, he was in Los Angeles, where he looked for acting parts and became a bodyguard for Will Smith, Jamie Foxx and other stars. The murder of rapper Notorious B.I.G., for whom Duncan had been hired to protect before switching assignments, led him to quit his job and pursue acting full-time.

Early film and television credits, when he was usually cast as a bodyguard or bouncer, included Bulworth, A Night at the Roxbury and The Players Club.

* Pictured above is Michael Clarke Duncan