Caroline Ellison, a former top executive in Sam Bankman-Fried ’s fallen FTX cryptocurrency empire, faces the possibility of years in prison when she is sentenced Tuesday for fraud, but prosecutors said she deserves leniency for her “extraordinary cooperation” as they investigated the company.

Ellison, 29, pleaded guilty nearly two years ago and testified against Bankman-Fried for nearly three days at a trial last November.

In a court filing, prosecutors said said her testimony was the “cornerstone of the trial” against Bankman-Fried, 32, who was found guilty of fraud and sentenced to 25 years in prison.

Asking the court for a lighter sentence, Ellison’s own lawyers cited both her testimony at the trial and the trauma of her off-and-on romantic relationship with Bankman-Fried — though they also stressed that she wasn’t trying to evade responsibility for her crimes.

“Caroline blames no one but herself for what she did,” her lawyers wrote in a court filing. “She regrets her role deeply and will carry shame and remorse to her grave.”

FTX was one of the world’s most popular cryptocurrency exchanges, known for its Superbowl TV ad and its extensive lobbying campaign in Washington, before it collapsed in 2022.

U.S. prosecutors accused Bankman-Fried and other top executives of looting customer accounts on the exchange to make risky investments, make millions of dollars of illegal political donations, bribe Chinese officials and buy luxury real estate in the Caribbean.

Ellison was chief executive at Alameda Research, a cryptocurrency hedge fund controlled by Bankman-Fried that was used to process some customer funds from FTX.

Her work relationship with Bankman-Fried was complicated by her romantic feelings for him, her lawyers wrote in a court filing.

“From the start, Mr. Bankman-Fried’s behavior was erratic and manipulative. He initially professed strong feelings for Caroline and suggested their liaison would develop into a full relationship. But after a few weeks, he would ‘ghost’ Caroline without explanation, avoiding her outside of work and refusing to respond to messages that were not work-related,” her lawyers said.

As the business began to faulter, Ellison divulged the massive fraud to employees who worked for her even before FTX filed for bankruptcy, her lawyers wrote.

Ultimately, she also spoke extensively with U.S. investigators.