Arizona Cardinals tight end John Carlson has announced his retirement from football, a week shy of his 31st birthday. In a statement released by the team, Carlson said that after ''much thought and consideration,'' he and his wife Danielle decided this was the best decision. The 6-foot-5, 248-pound Carlson played seven NFL seasons with Seattle, Minnesota and Arizona. He had a history of concussions before signing with the Cardinals last offseason. More...