Benjamin is top 10 on Arizona State's career list in rushing yards, touchdowns, attempts and 100-yard games. He also set the school single-game record with 312 yards rushing against Oregon State in 2018.
"I've worked my entire life for this and today it has finally paid off," he said. "I've dedicated countless hours to my education and sacrificed many things over the past three years to get here. As of today, I am an ASU alum."
The hard-running Benjamin was fifth nationally in 2018 with a school-record 1,642 yards rushing and scored 16 touchdowns while earning third-team All-American honors from The Associated Press.