The Detroit Lions aren't done bolstering their defensive line yet.
Defensive tackle Stefan Charles, who was non-tendered as a restricted free agent by the Buffalo Bills earlier this week, agreed to terms on a one-year deal with the Lions today.
Charles appeared in 13 games with one start for the Bills last year. He had 13 tackles and one sack.
The Lions re-signed Haloti Ngata to a two-year deal on Wednesday and kept Tyrunn Walker with a one-year extension last week, ensuring their top four interior linemen from last fall are under contract.