Derrick Ward has decided to retire after playing eight seasons with three different teams. "To all my fans just wanted to let u know its been a great ride the last 9yrs but I'm calling it a career. I thank u all for believing in me," the running back Tweeted on Tuesday. Ward spent the past two seasons with the Texans, but made it clear last month his run with the team is over. He also played for the Giants and Buccaneers.