Achilles tendon rupture
On July 31, 2011, Siler signed with the Kansas City Chiefs. He was placed on the injured reserve list due to an Achilles tendon rupture on August 25, and appeared in no games during the 2011 season. Siler played in 16 games in 2012, starting four of them. His contract expired after the 2012 NFL season, and he was not re-signed. In five NFL seasons, Siler played in 74 games, started 16 of them, and compiled 180 tackles, two interceptions and three recovered fumbles.