Buffalo Bills RB Karlos Williams passes physical, returns to practice

The Buffalo Bills activated Karlos Williams from the active/non-football illness list Monday after the second-year running back passed his physical.

Williams, who showed up for offseason workouts 20-25 pounds overweight, has been suspended for the first four games of the regular season for violating the NFL's substance-abuse policy.

The 23-year-old Williams is eligible to participate in preseason activities. He had been working on the side during training camp with the strength and conditioning staff to lose the weight.

During his rookie season last year, Williams had 93 carries for 517 yards and seven touchdowns.