Allen Park — The Detroit Lions officially placed safety Tracy Walker on injured reserve Monday afternoon and signed linebacker Anthony Pittman to fill the roster spot.
Walker suffered a torn Achilles in the early stages of Sunday's game against the Vikings and will miss the rest of the season.
"Losing Tracy hurts," Lions coach Dan Campbell said Monday. "Since I walked in the door last year, he's been all-in. And he's one of our team captains this year. Nobody has put in more work than he has since the spring. He is one of the smartest players we have on defense.