The 49ers fire defensive coordinator Steve Wilks after their Super Bowl loss

San Francisco 49ers defensive coordinator Steve Wilks, center, watch as players practice at the team's training facility Friday in Santa Clara, Calif. The 49ers will face the Kansas City Chiefs in Super Bowl 58. (AP Photo/Tony Avelar)

San Francisco 49ers defensive coordinator Steve Wilks walks on the field before Super Bowl 58 against the Kansas City Chiefs Sunday in Las Vegas. (AP Photo/George Walker IV)

SANTA CLARA, Calif. — The San Francisco 49ers fired defensive coordinator Steve Wilks on Wednesday, three days after losing the Super Bowl to the Kansas City Chiefs.