Sam Penrod Reporting

Guilty. That's the plea today of a former BYU football player in the alleged sexual assault last year of an underage girl.

Karland Bennett today pleaded guilty to dealing in harmful material to a minor and obstructing justice. But the serious charges of sex assault were dropped. And now he will testify against two of his former teammates at their trial later this month.

This is a very significant development in this case, which has dragged on for months. Today we finally learned more details of what happened one year ago today.

Karland Bennett entered guilty pleas to a second and third degree felony, but the two counts of aggravated sexual assault, which could have sent him to prison for life, were dropped.

Prosecutors say that Bennett has given them the entire story of what happened in the off campus apartment complex last August, and they say Bennett passed a lie detector test confirming his story.

They say Bennett only aided and abetted his co-defendants in the assault, but that by showing a pornographic video to the victim and then coming up with a story with the other suspects about what to tell the police, Bennett obstructed justice.

Greg Skordas, Defense Attorney: "He wasn't involved at all in any sexual assault, but unfortunately, he was involved afterwards in how the investigation went and didn't tell the truth the entire time about what happened."

Bennett contends it was BJ Mathis and Ibrahim Rashada who sexually assaulted the 17-year old girl. They are the last two defendants who have not yet resolved the allegations in court.

Today the victim attended Bennett's court hearing and her parents released a statement saying, "Several of the defendants have shown enough integrity to admit their involvement. For that we are grateful. Others have chosen to continue in denial."

Both BJ Mathis and Ibrahim Rashada are due in court tomorrow morning, when we should learn if their trial will go forward as planned later this month. As for Karland Bennett, he does face some prison time, but any special consideration for a lighter sentence was NOT part of the plea deal.