Lions safety Tracy Walker is out for the season after the he said he tore his Achilles during Sunday's game against the Minnesota Vikings.
Walker, 27, has had a great season so far, racking up 18 tackles, one sack and one pass deflection in his first two games. He was the Lions leading tackler.
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The injury happened in the first quarter of the game when he was trying to tackle Vikings RB Dalvin Cook.