(AP) -- Oregon running back Thomas Tyner has decided to take a medical retirement after sitting out all of last season because of a shoulder injury.
Tyner was the Ducks' third-leading rusher as a true freshman in 2013 and then again as a sophomore in 2014. He finishes his Oregon career with 1,284 yards rushing and 14 touchdowns.
"Thank you for all the support over the years," Tyner wrote in a Twitter post. "Couldn't have been more blessed to have been part of such a great community, I have the utmost respect for the staff and my teammates. Now it's time to get in the books and finish up in school. Much love to you all and Go Ducks!"