PROVO — Ty’Son Williams’ season is over after just four games, as the BYU running back shared on social media he tore his left ACL.

Williams, a grad transfer from South Carolina, was injured late in the first half of the Cougars’ 45-19 loss to Washington on Saturday. BYU has not confirmed the news as of yet.

“Unfortunately my 2019 season has come to an end due to an ACL (t)ear in my left knee. Having no regrets as every time I gave it my all when I was out there,” Williams wrote on Instagram Sunday afternoon.

The 6-foot, 220-pound running back had 264 rushing yards on 49 carries this season for BYU, with three touchdowns. That included the game-winning touchdown in double overtime in the Cougars’ 29-26 victory at Tennessee. In the win over the Volunteers, Williams rushed for 92 yards and two touchdowns on 17 carries, and he followed that with a 99-yard rushing day against USC the next week in a 30-27 overtime win over the Trojans.

Williams also had seven receptions for 47 yards.

“I appreciate all my family and friends reaching out as I always say ‘I love y’all.’ Unsure of what the next chapter holds, but I know the LORD will be (i)nvolved so Ihave no worries. To my brothers I leave out there on the field finish the mission we still have everything ahead of us. Go Cougs!” Williams wrote on Instagram.

Grid View Brigham Young Cougars head coach Kalani Sitake looks on as Brigham Young Cougars running back Ty’Son Williams (5) is helped after an injury in Provo on Saturday, Sept. 21, 2019. Jeffrey D. Allred, Deseret News

Brigham Young Cougars running back Ty’Son Williams (5) is injured in Provo on Saturday, Sept. 21, 2019. Jeffrey D. Allred, Deseret News

Brigham Young Cougars running back Ty’Son Williams (5) is injured while running against the Washington Huskies in Provo on Saturday, Sept. 21, 2019. Jeffrey D. Allred, Deseret News

Williams was one of two graduate transfers to join the Cougars this season, along with Emmanuel Esukpa from Rice. BYU added the duo to help bolster the team’s depth at the position.

With Williams gone, Esukpa and sophomore Lopini Katoa should take on expanded roles in the Cougar backfield. Esukpa rushed for a team-high 49 yards and a 1-yard touchdown for BYU on Saturday against the Huskies and has 80 rushing yards on the season. Katoa, meanwhile, has rushed for 23 yards on the year.