Devin Thomas announced his retirement via Twitter on Sunday and the Bears later confirmed he has indeed called it quits. "I have decided to retire from the NFL," Thomas wrote. "God has blessed me (with) achieving a childhood dream," Thomas added. "I want to give back to my hometown and coach/mentor kids so they can reach their own." Thomas told ESPN.com that he'd been considering retiring for some time, but the daily grind of training camp played a role in coaxing out the decision.