The Detroit Lions had their worst fear on Tracy Walker's injury status confirmed Monday.
Walker, who left Sunday's 28-24 loss to the Minnesota Vikings with an injury in the first quarter, said on Twitter, "I appreciate all the support from my fans and friends. It is true that I tore my Achilles and I'm done for the season but I'll bounce back and be better than ever for the following years to come."
Walker, 28, signed a three-year, $25 million extension ($16 million guaranteed) with the Lions this past offseason. He was in his first season as captain of the Lions' defense.