DANBURY, Conn. (AP) — Caroline Ellison, a former top executive in Sam Bankman-Fried ’s fallen FTX cryptocurrency empire, began her two-year prison sentence Thursday for her role in a fraud that cost investors, lenders and customers billions of dollars.

Caroline Ellison, the key witness in the case against FTX founder Sam Bankman-Fried, arrived at a low-security federal prison in Connecticut on Thursday, according to a Bureau of Prisons official. TakeAway Points: In the Connecticut suburbs,

Caroline Ellison, who pleaded guilty to fraud charges tied to the collapse of crypto exchange FTX, is beginning her two-year prison sentence.

An ex-FTX executive who testified against the cryptocurrency firm's founder at his trial last year has been spared a prison sentence.

Nishad Singh, former engineering director of the collapsed crypto exchange FTX, has been spared a prison sentence after providing substantial cooperation in the case against FTX founder Sam Bankman-Fried.

Ellison, 30, reported to the federal prison in Danbury, Conn., according to the Federal Bureau of Prisons. She had pleaded guilty and testified extensively against Bankman-Fried, her former boyfriend,