The Detroit Lions' coaching staff has undergone the biggest changes yet this offseason under fifth-year head coach Dan Campbell.

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.

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.

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.

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.

Williams reunites with coach Mike Vrabel in New England after working on Vrabel's staff for six years with the Titans.

Detroit Lions defensive line coach Terrell Williams is departing the organization and ... Detroit has struggled to maintain consistency at the defensive line coach position under Dan Campbell. When the decision is made, Campbell will hire his fourth ...

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

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 ...

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.