Jim Mandich, who won two Super Bowl rings with the Dolphins and later became a popular radio announcer for the team, died Tuesday at age 62. The Dolphins confirmed the death of Mandich, who was also a star at Michigan. He was diagnosed with bile-duct cancer in early 2010, but continued to work on game broadcasts last season. Mandich was a tight end for the Dolphins when they achieved the NFL's only perfect season in 1972, and he helped them repeat as Super Bowl champions the following year.