Here are four things to know about new Patriots defensive coordinator Terrell Williams. Read more on Boston.com.

News quickly followed that defensive line coach, Terrell Williams ... For the first time since Dan Campbell arrived in Detroit, the future appears ... cloudy? Uncertain? Pick your term.

It’s been a long time coming, but Ben Johnson (Chicago Bears) and Aaron Glenn (New York Jets) are off to run their own franchises. Who they take with them is the next question, but what we do know right now is that Dan Campbell is tasked with replacing two of his closest confidants in the middle of a Super Bowl window.

Terrell Williams, who Dan Campbell has described as the NFL's best defensive line coach, has left the Lions to become the DC in New England.

Terrell Williams spent six seasons working with new Patriots coach Mike Vrabel before coming to Detroit last winter.

Detroit Lions defensive line coach Terrell Williams is departing the organization and will accept the defensive coordinator position with the New England Patriots. Williams had previously worked with Patriots head coach Mike Vrabel during their stint with the Tennessee Titans.

The 50-year-old Williams coached defensive line for Mike Vrabel for six seasons in Tennessee, also serving as the team’s assistant head coach for Vrabel’s final season.

A report from @mzenitz indicates that the New England Patriots are targeting Lions' DL coach Terrell Williams to be their new DC. He worked closely with Patriots HC Mike Vrabel in Tennessee. Another change to the coaching staff could be on the horizon @DetroitPodcast

The Patriots are targeting Lions defensive line coach Terrell Williams to be their new defensive coordinator under Mike Vrabel, Matt Zenitz of CBS Sports reports.

Dan Campbell will be looking for more than just ... Detroit Lions defensive line coach Terrell Williams agreed Wednesday to join new New England Patriots coach Mike Vrabel's staff as defensive ...

Holmes set a precedent with his approach to the 2021 draft class, as core players Amon-Ra St. Brown and Penei Sewell both signed big extensions. The Lions also handed hefty extensions to Jared Goff, Alim McNeill and Taylor Decker.

Former offensive coordinator Ben Johnson is off to Chicago to lead the Bears. Former defensive Aaron Glenn is now the head coach of the New York Jets. Both will be missed in Detroit, but Campbell and company must move forward with the assistants remaining. That process has already begun.