Williams, who was signed by the 49ers as an undrafted free agent in 2011, has 3 tackles in 4 games.
Following the news, Williams posted the following on Twitter:
Proud to be apart of this organization, city and fan base for another few years! Just got done signing my extension! #49ers #GrindTime
— Ian Williams (@IWilliams95) March 11, 2013
More San Francisco 49ers News
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No sign of Nick Bosa or Trent Williams at 49ers' Thursday practice
The San Francisco 49ers took the practice field on Thursday for the second session of the week, with one more practice scheduled for Friday before hosting the Chicago Bears at Levi's Stadium on Sunday. However, two key starters—defensive end Nick Bosa and tackle Trent... -
No Nick Bosa or Trent Williams at final 49ers practice before Bears game
Defensive end Nick Bosa and left tackle Trent Williams were absent during the early portion of Friday's practice, the segment open to the media. Neither player has participated in practice this week, raising significant doubts about their availability for Sunday's matchup... -
49ers vs. Bears final injury report: Williams won't play, Bosa doubtful
The San Francisco 49ers are preparing for their Week 14 contest against the Chicago Bears on Sunday at Levi's Stadium in Santa Clara, California. Both teams have released their official injury reports, which are provided below. San Francisco 49ers Out LB Dre Greenlaw... -
49ers injuries: Shanahan provides updates on Guerendo, Greenlaw, Purdy, Bosa, Williams, others
San Francisco 49ers head coach Kyle Shanahan addressed reporters during a Monday conference call, a day after the team's dominant 38-13 victory over the Chicago Bears. He shared several injury updates from the Week 14 matchup. The 49ers face a short week of preparation as they...