BYU running back Ty’son Williams announced on Twitter late Sunday afternoon that he is out for the season with a torn ACL.

Williams left BYU’s Saturday game against Washington just before halftime after injuring his left knee and did not return. He walked off on his own power, but an exam later Saturday revealed the tear.

“Unfortunately my 2019 season has come to an end due to an ACL [tear] in my left knee,” Williams said in the tweet. "Having no regrets as every time I gave it my all when I was out there. I appreciate all my family and friends reaching out as I always say “I love y’all.”

In BYU’s first four games, Williams rushed for 264 yards on 49 carries and three touchdowns, adding another 47 yards on seven receptions, giving the Cougars an explosiveness at the running back position that they haven’t had for awhile.

Williams’ season highlight came when he scored the game-winning touchdown in the second overtime of BYU’s win at Tennessee.

Williams, a graduate transfer from South Carolina (and North Carolina before that), remains optimistic about the long term.

“Unsure of what the next chapter holds, but I know the LORD will be [involved] so I have no worries,” he said in another tweet. "To my brothers I leave out there on the field finish the mission we still have everything ahead of us. Go Cougs!

If he chooses to, Williams could be eligible for a 6th year waiver.