Barnwell - The NFL-altering Andrew Luck retirement, and what comes next ESPNOpinion: Andrew Luck shows strength in walking away. But some Colts fans just don't get it USA TODAYAndrew Luck Retires! | NFL News NFLLuck retires, calls decision 'hardest of my life' ESPNGlauber: Andrew Luck walks off on own terms NewsdayView full coverage on Google News