Linebacker Christian Kirksey has announced his retirement after nine seasons in the NFL. Kirksey spent the first six years of his career with the Cleveland Browns, one season with the Green Bay Packers, and the last two years with the Houston Texans. He finished his career with 778 total tackles, 16.5 sacks, 45 tackles for loss, and 33 passes defensed. The Buffalo Bills signed linebacker A.J. Klein back to the practice squad in a corresponding move.