(CNN) Former House Speaker Dennis Hastert sexually abused at least four boys when he coached wrestling at a high school in Illinois decades ago, federal prosecutors said.
In documents released Friday, prosecutors detailed stunning allegations against Hastert, the longest-running Republican speaker of the House.
The revelation comes days before his April 27 sentencing in a financial violation case. He pleaded guilty last year to structuring money transactions to evade reporting where he took massive amounts of funds he was withdrawing.
Investigators said the transactions involved $3.5 million he paid in hush money to one of his accusers.
Prosecutors listed four boys Hastert allegedly abused at a high school in Yorkville, Illinois.
An additional one -- a fifth student -- died years later, according to the document.
The accusations came to light after investigators found out he was paying an ex-student to stay quiet about sexual abuse allegations, prosecutors allege.
The student was among four others who told investigators he abused them, including one who was 14 at the time, the documents allege.
The allegations date to the 1960s and 1970s, according to the prosecutors' court filing.
Hastert will not face sexual abuse charges because the statutes of limitation have expired.
All those who accused him of sexual abuse were wrestlers at the high school, according to the documents.
In two separate cases, Hastert massaged one boy each in a locker room and performed unspecified sexual acts on them, prosecutors allege.
In another instance, he allegedly massaged a boy's groin area and singled him out to stay in his hotel room during a wrestling camp.
Another accuser said Hastert touched him inappropriately in a "very weird" way while he was a student, prosecutors said.
"The actions at the core of this case took place not on the defendant's national public stage but in his private one-on-one encounters in an empty locker room and a motel room with minors that violated the special trust between those young boys and their coach," prosecutors said.
During his time at Yorkville High School, Hastert was a beloved coach. He was named Illinois coach of the year after leading the wrestling team to the state championship.
In a statement Saturday, Hastert 's attorney Thomas Green said the former speaker "acknowledges that as a young man he committed transgressions for which he is profoundly sorry."
"He earnestly apologizes to his former students, family, friends, previous constituents and all others affected by the harm his actions have caused," Green said.
Hastert has already suffered "profound humiliation and public shaming" and is in poor health, Green added.
Hastert was hospitalized with various ailments late last year, including a stroke and sepsis. His attorneys have asked for probation instead of jail time in the financial case.
"He accepts responsibility for his conduct, seeks no special consideration, and is prepared to receive the court's sentence," Green said.
Before details of the sexual abuse allegations came to light, Hastert also apologized this week for an unspecified misconduct.
Hastert served as the Republican speaker of the House between 1999-2007.