San Francisco 49ers defensive lineman Mykel Williams will miss the rest of the season after the first-round pick was diagnosed with torn ligaments in his right knee.

Williams got hurt late in the fourth quarter of Sunday's win at the New York Giants . Coach Kyle Shanahan said tests Monday confirmed the initial fears that he had a torn ACL and a torn lateral meniscus.

The injury to Williams is the latest blow for a banged-up 49ers defense. Star edge rusher Nick Bosa was sidelined by a season-ending knee injury in Week 3, and four-time All-Pro linebacker Fred Warner was knocked out by an ankle injury in Week 6.

San Francisco also placed defensive lineman Yetur Gross-Matos on injured reserve last week with a hamstring injury, and edge rusher Bryce Huff has missed the past two games wit

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