For the first time in 25 years, the Patriots will have a new-look defense. Here's what to expect out of Terrell Williams and Mike Vrabel's unit.

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

After the Patriots let go of Belichick and Pellegrino, Vrabel has worked quickly to bring in multiple defensive coaches. Booker coached safeties in Tennessee. The Patriots also added Kevin Richardson II, who was an assistant defensive backs coach at the University of Illinois.