CHICAGO — Dennis Hastert agreed to pay $3.5 million to a person the former House speaker sexually abused when the victim was 14 years old and Hastert worked as a high school teacher and wrestling coach outside Chicago, prosecutors said in a court filing Friday.

The filing is the first time prosecutors have confirmed Hastert paid hush money to conceal sexual abuse of a 14-year-old.

The 74-year-old Republican managed to keep any hint of sexual misconduct quiet throughout a political career that carried him from the Illinois Legislature to the halls of Congress and eventually to the speaker’s office, where he was second in the line of succession to the presidency.

Hastert pleaded guilty in October to breaking banking laws as he sought to pay $3.7 million to someone referred to as Individual A to ensure the person kept quiet about Hastert’s past misconduct. He is scheduled to be sentenced on April 27.

A defense filing Wednesday asked the presiding judge to give Hastert probation and spare him prison time. It cited Hastert’s deteriorating health, as well as the public shame he’s already suffered. The filing said Hastert is devastated by his public disgrace, apologetic and “overwhelmed” by guilt.

The case has been shrouded in secrecy since the May 2015 indictment. Prosecutors only confirmed at a March hearing that sex-abuse claims were at its core. But there was no prior word of the hearing, so the court was mostly empty. Transcripts later revealed what transpired.

The Associated Press and other media outlets, citing unnamed sources, reported last year that Hastert wanted to hide claims he sexually molested someone. But Friday’s filing is the first time prosecutors offered extensive details about his misconduct.

Hastert made 15 withdrawals of $50,000 – for a total of $750,000 – from 2010 to 2012. It’s what he did next that made his actions a crime. After learning withdrawals over $10,000 are flagged, he withdrew cash in smaller increments, taking out $952,000 from 2012 to 2014.

Court records say Hastert managed to pay $1.7 million to Individual A – handing it over in lump sums of $100,000 cash – starting in 2010. The payments abruptly stopped late in 2014 after FBI agents questioned Hastert about his massive cash withdrawals.

Hastert worked at Yorkville High School from 1965 to 1981, when he left for the state legislature. He entered Congress in 1987. His reputation for congeniality helped him become the longest-serving Republican speaker. He retired in 2007 after running the chamber for eight years.