Irving, TX (Sports Network) - The Dallas Cowboys on Friday signed free agent safety Ken Hamlin. No further details of the signing have been released. Hamlin, who will be entering his fifth season, spent his first four years in the NFL in Seattle after the team drafted him in the second round of the 2003 draft. Last season he tied a career-high in tackles with 96 and also had two sacks and three interceptions as he appeared in every game with the Seahawks. In 54 games, Hamlin has amassed 298 tackles with four sacks and eight interceptions in his career.