Miami Dolphins defensive end William Hayes is out for the season with a torn ACL in his right knee, coach Adam Gase confirmed Monday.
Hayes suffered the injury while trying to sack Oakland quarterback Derek Carr in the second quarter of the undefeated Dolphins' 28-20 win against the Raiders on Sunday.
"It hurts," Gase said. "He's one of our leaders in the locker room. ... That's going to be a tough one to swallow."
Hayes, 33, recorded two sacks during Miami's 3-0 start. He is in his second season with the Dolphins after four years with the Titans (2008-11) and five with the Rams (2012-16). He has 37.5 career sacks in 137 games.
Ian Rapoport of NFL Network reported Monday that Hayes' injury occurred while he was trying to avoid putting his body weight on Carr.