Bills' Pro Bowl linebacker Takeo Spikes will miss the rest of the season with a torn right Achilles' tendon. The Bills announced the news Monday a day after Spikes was hurt in a 24-16 loss to Atlanta. The injury is a significant blow to a veteran defense being counted on to relieve the pressure on first-year starting quarterback J.P. Losman. Angelo Crowell will replace Spikes. Buffalo's defense has struggled even with Spikes healthy, allowing a combined 721 yards in its last two games, including a 19-3 loss at Tampa Bay on Sept. 18. Spikes was hurt in the second quarter pressuring quarterback Michael Vick. It's unclear what happened on the play, but Spikes was left lying face down on the field a few feet in front of Vick, who had overthrown receiver Roddy White.