Fooch’s update: The 49ers have confirmed the news. Here’s their info on Jones:
Jones (6-1, 293) was originally drafted in the sixth round (198th overall) of the 2013 NFL Draft by the Houston Texans. Following his release from Houston on Aug. 31, 2013, he spent time with the Tampa Bay Buccaneers and was later acquired off waivers by the New England Patriots on Sept. 11, 2013. In three seasons with New England (2013-15), he appeared in 28 games (23 starts) where he registered 79 tackles and nine sacks. In four postseason contests (two starts) with the Patriots, he had nine tackles, one sack and one fumble recovery.