When Vrabel was named Titans head coach in 2018, he hired Williams to coach the defensive line, and by 2023 named him assistant head coach and had him serve as head coach of the team's preseason opener. Vrabel cited Williams' ability to "reach every player" across the roster -- including offense.

The New England Patriots have turned over a good percentage of their coaching staff from 2024 to 2025, including Terrell Williams replacing DeMarcus Covington as the team's defensive coordinator. Williams joins New England with 27 years of coaching experience split between 14 in college and 13 in the NFL.

New England Patriots linebacker Ja’Whaun Bentley is fired up about the team hiring Terrell Williams as the new defensive coordinator. Bentley made his feelings known on social media.