Why did Andrew Luck abruptly retire?
Is it hard for athletes to retire at the top of their game? - Quora
Luck retires, calls decision 'hardest of my life' - ESPN
Barnwell - The NFL-altering Andrew Luck retirement, and what comes
Andrew Luck finally reveals why he walked away from the NFL - ESPN
Andrew Luck finally reveals why he walked away from the NFL - ESPN
ESPN - Andrew Luck is retiring from the NFL, per Adam Schefter
Why did Andrew Luck abruptly retire?
Andrew Luck retires: Why did Andrew Luck quit
Transcript of Andrew Luck's retirement news conference - ESPN
Andrew Luck finally reveals why he walked away from the NFL - ESPN
Stephen A. reacts to Andrew Luck's sudden retirement from the NFL