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Re:Follow up to the investigation results by offbrand on Monday April 28, 2014 @05:28PM (#7663209)
Perhaps he resigned before the investigation was over.
Re:Follow up to the investigation results by rhizome on Monday April 28, 2014 @07:40PM (#7663880)
It's right there in the statement:

After being presented with the results we felt Tom could no longer be an effective leader at GitHub. He offered his resignation and we accepted.