Jerry Sandusky leaves Centre County Courthouse after the first day of his trial. (Gene J. Puskar / AP)

The trial of Jerry Sandusky on over 50 charges of child sexual abuse involving 10 boys over 15 years began with graphic testimony from one of his alleged victims Monday in Bellefonte, Pa.

The first witness, the alleged Victim No. 4, testified for over four hours Monday that Sandusky, the former Penn State defensive coordinator who had established a charity for at-risk children, turned him into an unofficial mascot for the football team — at a cost of increasingly intimate encounters.

In the morning session today, alleged Victim No. 1 wept as he testified about being abused in the basement of Sandusky’s home.

In the afternoon session, Mike McQueary was called to the witness stand by the prosecution. An assistant coach, he allegedly witnessed Sandusky raping a young boy in the showers at Penn State and told former Joe Paterno about what he had seen

Sandusky, who is expected to take the stand in his defense, has maintained his innocence since charges were filed against him last November.

For up-to-the-instant updates from the trial, follow a Twitter stream from reporters in the courtroom, including The Post’s Jenna Johnson, after the jump.

Please remember that testimony and evidence will continue to be graphic.

In other news Monday, NBC reported that internal Penn State e-mails obtained by investigators show that Graham Spanier, the school’s former president, and another PSU official agreed it would be “humane” not to report to authorities an alleged encounter between Sandusky and a boy in the locker room shower.

Gary Schultz, who was the school’s senior vice president for finance and business, and Timothy Curley, who was the athletic director, are awaiting trial on charges of perjury and failing to report suspected sexual abuse. They are no longer in their Penn State posts. Spanier remains a faculty member and has not been charged with any crimes.

Follow us: @CindyBoren | @MattBrooksWP

More coverage

Witness says Sandusky treated him “as a girlfriend”

Analysis: Yahoo’s Dan Wetzel on Day 1

The original grand jury report

A second grand jury presentment

Timeline: How the scandal unfolded

Early LeadSandusky’s wife says her husband is innocent

Early Lead: Sandusky tells Bob Costas he showered with boys but denies abuse