Daniel Friedberg, the former top lawyer at collapsed cryptocurrency exchange FTX, shared information with US prosecutors about the alleged misuse of customer funds by FTX founder Sam Bankman-Fried, according to Reuters.

Friedberg participated in a meeting on November 22 with officials from the Federal Bureau of Investigation, the Department of Justice, and the Securities and Exchange Commission at the US Attorney’s office for the Southern District of New York.

Friedberg reportedly explained the workings of FTX’s sister trading firm, Alameda Research, to the officials. Friedberg is not under criminal investigation and is expected to be a witness in Bankman-Fried’s trial, which is scheduled for October.

Bankman-Fried has been charged with fraud and accused of misusing billions of dollars worth of FTX customer funds and funneling them into Alameda. He has pleaded not guilty in a New York federal court.

In contrast, Caroline Ellison, the former CEO of Alameda Research, and Gary Wang, the former CTO of FTX, pleaded guilty to fraud charges in December.