Matt Maiocco of CSN Bay Area (MaioccoCSN) reports that the San Francisco 49ers have agreed to terms with free-agent safety Madieu Williams, according to a source.

Williams was the NFL's 2010 Man of the Year and started 13 games last season for the Vikings.

Maiocco feels that the signing could cast some serious doubt on whether Dashon Goldson is coming back to 49ers.