(CBS/AP) BELLEFONTE, Pa. - Former Penn State assistant coach Mike McQueary told jurors in Jerry Sandusky's sex abuse trial Tuesday that he saw his ex-colleague with a prepubescent boy in an on-campus shower and that he that he heard "skin-on-skin smacking sound."
His account of the night was mostly the same as his December appearance at a preliminary hearing for Penn State administrators Tim Curley and Gary Schultz, except that he said Tuesday that the shower encounter took place in 2001 instead of 2002.
Sandusky is on trial on 52 criminal counts related to the alleged assaults of 10 boys during a 15-year period. Authorities allege Sandusky abused boys at his home and inside the football team's on-campus facilities among other places. Two alleged victims have testified thus far in the trial, which began Monday.
McQueary told the jury that he was at home, in bed, watching the film "Rudy," when he decided to go to the football team building. He said he walked into the support staff locker room to put away a pair of new sneakers and, as he opened the door, he heard the noise.
"Very much skin-on-skin smacking sound," he said. "I immediately became alert and was kind of embarrassed that I was walking in on something."
He said that he turned and glanced over his right shoulder at a mirror that had a 45-degree angle and saw Sandusky "standing behind a boy who was propped up against a wall." He estimated the boy to be 10 to 12 years old.
He said that the "boy's hands (were) up on the wall. The glance would have taken only one or two seconds. I immediately turned back to my locker to make sure I saw what I saw."
Then he put his shoes in the locker and slammed it shut, hard.
"I made the loud noise in an attempt to say 'Someone's here! Break it up!"' McQueary said.
When asked what he saw, McQueary said "the defendant's midsection was moving" subtly.
He said he then went upstairs to his office.
"It was more than my brain could handle," he said. "I was making decisions on the fly. I picked up the phone and called my father to get advice from the person I trusted most in my life, because I just saw something ridiculous."
He said he was very vague with his father on the phone, and that his dad, John, told him to leave immediately and come to the house. McQueary testified that he called head coach Joe Paterno early the next morning and went to his house to tell him what he saw. He said that "out of respect" and "my own embarrassment" he did not use the words "anal sex" when describing the incident.
McQueary said that he talked to the university's former athletic director Tim Curley and former vice president for business and finance Gary Schultz about the incident a week later and that he never went to the police because "In my mind Mr. Shultz represented the police, without a doubt."
Additional reporting by CBS News' Paula Reid in Bellefonte, Pa.