williams resigned with Montreal on February 15, 2013.

From the Alouettes Press Release - February 15, 2013.

Williams (5'11", 185 lbs.) finished tied for third place among Alouettes last season with 53 defensive tackles. The 27-year-old cornerback also made one interception which he returned for 37 yards on September 16 opposite the Saskatchewan Roughriders. The second-year Alouette also registered six defensive tackles in a single game twice in 2012. As a rookie, an injury-plagued secondary allowed Williams to break the Alouettes roster, recording 46 defensive tackles and an interception in just ten games.

 "Seth has been a solid contributor for us and we feel his game improved steadily with each game he has played," said Alouettes General Manager Jim Popp. "The CFL game has slowed down with each game of experience."