Williams will appear in the Pro Bowl for the fifth consecutive season and the sixth time in his eight-year NFL career. He had only one sack this season, finishing with 39 tackles, nine tackles for loss, 10 passes defended and one forced fumble while starting in all 16 games.
Kalil started in all 16 games this season and is set to be a free agent this spring.
O'Hara said last week that he might need surgery to repair an Achilles' tendon injury.
The Associated Press contributed to this report.