Eugene “Mercury” Morris, a two-time Super Bowl-winning running back for the Miami Dolphins, died Saturday. He was 77. His son announced Morris’ passing over social media on Sunday morning and the Dolphins confirmed the news, per The Miami Herald. Morris arguably was the most vocal advocate of the 1972 undefeated Dolphins team, which he led with 12 rushing touchdowns. He joined Larry Csonka in becoming the first teammates to rush for at least 1,000 yards in the same year. “It is with profound sadness that we announce the passing of Eugene “Mercury” Morris, legendary Miami Dolphins running back and cherished member of the NFL family, at the age of 77,” his family said in a statement over social media. “Known for his electrifying speed and dynamic play, Mercury was a cornerstone of the Dolphins’ historic 1972 undefeated season and a two-time Super Bowl champion. His talent and passion left an indelible mark on the sport, and his three Pro Bowl selections only solidified his place among football’s greats. “Beyond the field, Mercury was a dedicated father, a loving brother, a loyal friend, and a pillar in the community. His presence extended far beyond football, as he touched the lives of many throughout his time in Miami.” Morris rushed for 4,133 yards and 31 touchdowns and added 3,118 return yards and three scores with the Dolphins (1969-75) and then-San Diego Chargers (1976) before announcing his retirement. Morris is survived by five children and three siblings, per the family’s statement. –Field Level Media