Outgoing University of Michigan athletic director Bill Martin says he's apologized to two student security workers who reported he assaulted them during football games.

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The school said Monday it's closed an investigation of Martin's actions.
Michigan student Jackie Turner says Martin pushed her Sept. 12 when she requested his ID as he entered the regents guest area of the press box during Michigan's game against Notre Dame.
Eastern Michigan student Arif Khan says Martin grabbed him when he asked for his ID in the same general area Oct. 17 soon after the end of a game against Delaware State.
Four days later, Martin announced he was retiring next September.
The students weren't injured, and neither pressed charges.

Oddsmakers from online sports book SPORTSBETTING.com made Michigan a 200/1 long shot to win the 2010 BCS National Championship. The Wolverines were routed on Saturday by Penn State as 4-point home underdogs.

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Posted: 11/9/09 11:36PM ET