Jamie Walker apparently has cashed in on his career season. The Orioles signed the former Tigers lefthander to a three-year contract on Tuesday. Financial terms were not disclosed, but the Baltimore Sun reported that the deal was worth $11.5 million. Walker, 35, enjoyed an outstanding 2006 campaign for the American League champion Tigers, going 0-1 with a career-best 2.81 ERA in 56 relief appearances.