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Ex-Michigan LB Mike McCray, Dolphins rookie, retires from football

Michigan’s Jim Harbaugh discusses rivalry struggles. Nick Baumgardner, Freep

Just a few days before the start of NFL training camp, former Michigan football linebacker Mike McCray shared a bit of personal news on Twitter on Tuesday.

McCray, an undrafted free agent who signed with the Miami Dolphins, announced he was retiring from the game.

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"For some time now, I have been playing the game of football for the wrong reason and during this time I sacrificed my happiness and my well being," McCray wrote on social media.