Programming note: NFL free agency is well underway! Check out Matt Maiocco's 49ers free agent tracker and watch SportsNet Central nightly at 6 and 10:30 p.m. for all the latest football news.
Chris Cook, a 6-foot-2 cornerback who had his problems on and off the field for the Minnesota Vikings in his first four NFL seasons, signed a one-year contract with the 49ers, the club announced Friday.
Cook will compete for a roster spot on a team that also features Tramaine Brock, Chris Culliver, Eric Wright and Darryl Morris.
Seattle Seahawks cornerback Walter Thurmond visited the 49ers on Friday, and Tarell Brown remains unsigned as a free agent.
The No. 34 overall pick in the 2010 draft started 29 of the 33 games in which he appeared with the Vikings. He has no interceptions in his NFL career. Last season, he surrendered nine touchdown receptions, tied for worst in the league, according to Pro Football Focus.
Cook missed the final 10 games of the 2011 season after being charged with felony domestic assault by strangulation. He was acquitted of all charges.