dead of a heart attack at 54.

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.

source: Actor Michael Clarke Duncan Dies at 54 – NYTimes.com.

Kind of a dude you always rooted for.