Jeffrey Sandusky, son of Jerry Sandusky, pleaded guilty to child sex abuse charges on Friday, exactly one week before his trial was set to begin.

Centre County District Attorney Stacy Parks Miller announced Friday night that Sandusky, 41, of State College, had pleaded guilty to "all charges," which includes 12 felonies.

Jeff Sandusky is one of the notorious former Penn State football assistant's adopted children.

He was accused of soliciting two girls, ages 15 and 16, for oral sex and nude photos.

When the older teen refused to send Sandusky the photographs he demanded, Parks Miller said, he became more insistent, badgering her to comply over a two day period. Sandusky sought pictures of her "pissing", dressing, naked body parts and nudes. Sandusky instructed the victim in follow-up texts to delete the messages and to not tell anyone, Parks Miller said.

Sandusky's requests were rebuffed by both underage girls, who instead reported the alleged conduct to their parents, state police at Rockview said.

The investigation began in November, police said, and Jeff Sandusky was arrested at the home of his mother, Dorothy Sandusky in February.

He was charged with:

Criminal solicitation of statutory sexual assault by a person 11 years older;

Criminal solicitation of involuntary deviate sexual intercourse of a person less than 16 years old;

Two counts of criminal solicitation of photograph or film depicted on the computer of a sex act knowingly involving a child;

Six counts of communicating with a minor - sexual abuse;

Two counts of criminal solicitation of child pornography, all felonies, and two misdemeanor counts of corruption of minors.

As part of a plea agreement, Sandusky faces a minimum of three to six years in prison. Prosecutors will ask that he serve four to eight-years. Sandusky will have to register as the highest tier of sex offender in the state.

Parks Miller said her office was fully prepared to go to trial next week, but the plea ensures a "significant prison sentence.

"This outcome also ensures the victims need not suffer the trauma and re-victimization of testifying at trial and importantly, the defendant will have to comply with strict sex offender registration requirements for the remainder of his life. We are happy that these girls can move forward and experience a life with adults that deserve their trust," Miller said.

Jeffrey Sandusky, while largely silent to the press, had until recently been a Jerry loyalist through the progress of his father's criminal case, often appearing in court proceedings with his mother, Dottie.