The legal and compliance chief for Bulgaria-based crypto company OneCoin has been charged with running a pyramid scheme that conned global investors out of $4 billion.

Prosecutors say Irina Dilkinska helped Mark Scott, a former equity partner at the law firm Locke Lord, launder $400 million in proceeds from the scam. She was arrested Monday in Bulgaria and extradited to the United States on Tuesday, where she faces the same charges as her alleged co-conspirator Scott, who was convicted of conspiracy to commit money laundering and bank fraud in 2019.

"Irina Dilkinska, the supposed Head of Legal and Compliance for the OneCoin cryptocurrency pyramid scheme, accomplished the exact opposite of her job title and allegedly enabled OneCoin to launder millions of dollars of illegal proceeds through shell companies," U.S. attorney for the Southern District of New York Damian Williams said in a statement. "Dilkinska helped perpetuate a wide-ranging scheme with millions of victims and billions of dollars in losses, and she will now face justice for her alleged crimes."