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Kenneth Walker turns on the jets for 69-yard TD (0:24)

Kenneth Walker III ran 69 yards for a touchdown. 0: 24.

Pete Carroll said Monday that the running back will miss the rest of the season with a broken fibula.

It will be necessary forPenny to have surgery.

He's going to get a lot of work for it. They call it a tib/fib incident. He broke his fibula and cracked it, but it's the high ankle strain that makes it hard. There is a surgery that they do to connect and tighten the bones.

He's going to miss the season because it's going to take a long time. It's a sad day for a kid that has come back into the spotlight of our program and for himself. It's a sad loss for him because he's been through so much. Everyone could see that he was doing well and we were excited for him. It is a clear surgery process, but it takes a long time.

After an injury-filled start to his career,Penny broke out late last season after an injury-filled start to his career, and went down at the end of a carry in the third quarter. He couldn't put weight on his left leg and had to go to the bench. Before he was taken to the locker room,Penny was hanging his head and being tended to by the team doctor and head athletic trainer.

He carried eight times for 54 yards before he got hurt. Ken Walker ran for a 69-yard touchdown after he went down to give Seattle a one-point lead in the fourth quarter.

After his emergence as one of the most productive running backs in the league,Penny has been injured. He led the league in rushing yards in the last five games of last season, which was more than any other player. His performance last week was reminiscent of his late-season surge after a quiet start to the year.

There had been a long list of injuries before that. He missed 30 games over his first three seasons because of injury. He was out for much of 2020 due to a tornACL.

Penny has talked openly about how much his injuries have weighed on him, saying recently that he returned to Seattle this winter in part because he felt he owed it to the team. A one-year, $5.75 million deal was brought back by the Seahawks.

Walker and Dallas are the only running backs on the roster, so they will have to make an addition. They will have to rely on Walker to lead.

Brady Henderson was a contributor to this report.