In this screen grab provided by CBS, former Penn State graduate assistant Mike McQueary, left, speaks to CBS News Chief Investigative Correspondent Armen Keteyian, Tuesday, Nov. 15, 2011 at an unknown location. McQueary is cited by a grand jury report as witnessing Jerry Sandusky allegedly sodomizing a 10-year-old boy in a Penn State locker room.

STATE COLLEGE, Pa. — A day after the former Penn State assistant football coach charged with sexual abuse of boys declared his innocence in a television interview, an email surfaced from a key witness against him that says he stopped an alleged attack in the team's showers.

Mike McQueary, the graduate assistant who a grand jury report said saw Jerry Sandusky allegedly sodomizing a boy in the locker room, said he stopped the act and went to police.

That adds more confusion to an already emotionally raw situation that has enveloped Penn State University.

The email last week from McQueary to a friend says he made sure it was stopped when he left the locker room and that no one wants to be in his shoes for those 30 to 45 seconds.