Colts owner warns NFL teams about tampering with Andrew Luck
Former Stanford teammate Zach Ertz 'shocked' by Andrew Luck retirement – Delco Times
NFL's Andrew Luck retiring: How much money he made, could be giving up
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Andrew Luck finally reveals why he walked away from the NFL - ESPN
Andrew Luck retires, appears to be savagely booed by Colts fans in Indy after stunning news breaks during game
Kravitz: On Andrew Luck, the shock, the booing, the unimaginable fallout and other lasting impressions - The Athletic
Jacoby Brissett no Andrew Luck, but 'story's just starting' for Colts - ESPN - Indianapolis Colts Blog- ESPN