Walker is a seventh-year player who played the last two seasons in San Diego after four years in Arizona.
Walker has played in 75 regular season games with a half-dozen starts, all in 2013. His best season was 2013, when he had a career-high 36 tackles, three sacks and a fumble recovery.
For his career, he has 73 tackles, 3 1-2 sacks, one forced fumble, a fumble recovery and 25 special teams stops.
He entered the NFL as an undrafted free agent out of Kansas State in 2009.
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