To help fill the void created when starting NT Jamal Williams was placed on IR due to a triceps injury, the Chargers signed free-agent DT Alfonso Boone to bolster depth along the defensive line.

Boone, a nine-year veteran who played under Chargers defensive coordinator Ron Rivera for three years and defensive line coach Don Johnson two years with the Chicago Bears, signed a one-year contract with San Diego.

The 6-5, 305-pound Boone has appeared in 113 games in his career with 37 starts. He spent the last two seasons (2007-08) with the Kansas City Chiefs where he started 19 games at defensive tackle. Boone played for the Bears from 2000-06 and appeared in Super Bowl XLI with the club. The Saginaw, Michigan native was originally a seventh-round draft choice of the Detroit Lions in 2000 out of Mt. San Antonio College.

To make room for Boone on the 53-man roster, the team waived DE Andre Coleman.

For more on the Chargers, check out SD Bolt Report.

To get caught up on all the latest breaking news around the NFL along with insider analysis, sign up for Adam Caplan's Twitter Updates.