Leach has played in all 48 games over the last three seasons with Arizona. A 13-year NFL veteran, he played the previous seven seasons with the Denver Broncos. Leach has played 152 consecutive games, the longest streak on the team and third-longest active string for all long snappers.
Walker played in all 16 games for Arizona last season and was second on the team with a career-high 16 special teams tackles. He has played three seasons for the Cardinals after joining the team as an undrafted rookie free agent in 2009.