The Chargers signed LB Gary Guyton on Wednesday, according to Michael Gehlken of the San Diego Union-Tribune.
Guyton, a fifth-year pro, spent the 2012 preseason with the Dolphins. He played for the Patriots from 2008-11.
Last season, Guyton played in 13 games with six starts for the Patriots and made 47 tackles and one interception. Guyton adds depth for the Chargers at linebacker with both Donald Butler and Demorrio Williams battling injuries.