Andrew Luck being booed by Colts fans is a very bad look - Matt Hasselbeck | SportsCenter ESPNOpinion: Andrew Luck shows strength in walking away. But some Colts fans just don't get it USA TODAYAndrew Luck's retirement from the NFL shocks Ryan Clark | SportsCenter ESPNDoyel: Colts QB Andrew Luck shocks world by retiring, and for his sake I hope he's right Indianapolis StarGlauber: Andrew Luck walks off on own terms NewsdayView full coverage on Google News