ESPN's Adam Schefter reports the 49ers fear WR Kyle Williams tore a knee ligament in Sunday's Week 12 win over New Orleans.
Also a special teamer, Williams is the Niners' No. 4 receiver behind Michael Crabtree, Mario Manningham, and Randy Moss. A year-ending knee injury for Williams could get explosive first-rounder A.J. Jenkins onto the game-day roster.













