Former Miami Dolphins quarterback Earl Morrall died at age 79.

The Dolphins confirmed Friday that Morrall died. Former teammate Charlie Babb said his health had been in decline.

Morrall, who played in the NFL for 21 years, started nine games for the Dolphins during their perfect 1972 season.

Morrall subbed for Bob Griese when he broke an ankle during the '72 season. Morrall went back to the bench when Griese returned for the AFC title game and the winning Super Bowl.

The Dolphins finished 17-0, the only undefeated season in NFL history.

Morrall was the NFL MVP for the Baltimore Colts in 1968, but the heavily-favored Colts lost Super Bowl III to Joe Namath and the New York Jets.

Morrall also played for the San Francisco 49ers, Pittsburgh Steelers, Detroit Lions and New York Giants.