Walton was released Tuesday by Denver. A third-round pick out of Baylor in 2010, Walton started 36 regular-season games for the Broncos. He dislocated his ankle on Sept. 30, 2012, and was placed on injured reserve. He was on the physically unable to perform list for the first eight games before being activated.
Lewis was signed to the active roster Nov. 21, but made no impact.