MIAMI GARDENS, Fla. -- Eugene "Mercury" Morris, who starred for the unbeaten 1972 Miami Dolphins as part of a star-studded backfield and helped the team win two Super Bowl titles, has died, the team said Sunday. Morris, a three-time Pro Bowl selection, was 77. In a statement, his family said his "talent and passion left an indelible mark on the sport." "Beyond the field, Mercury was a devoted father, a loving brother, a loyal friend, and a pillar in the community," his family wrote. "His presence extended far beyond football, as he touched the lives of many throughout his time in Miami." Morris was the starting halfback and one of three go-to runners that Dolphins coach Don Shula used in Miami's back-to-back title seasons of 1972 and 1973, alongside Pro Football Hall of Famer Larry Csonka and Jim Kiick. Morris led the Dolphins in rushing touchdowns in both of those seasons, finishing with an NFL-best 12 in 1972 and then 10 more in 1973. "It's a very sad day for me and...