Agents arrested two individuals, married couple Ilya "Dutch" Lichtenstein and Heather Morgan, in New York on this week on charges they conspired to launder proceeds from the Bitfinex hack in 2016. The DOJ release alleges the two conspired to launder these proceeds and heavily implies, but does not claim, they were the original hacker(s).
“After the execution of court-authorized search warrants of online accounts controlled by Lichtenstein and Morgan, special agents obtained access to files within an online account controlled by Lichtenstein,” the press release said. “Those files contained the private keys required to access the digital wallet that directly received the funds stolen from Bitfinex, and allowed special agents to lawfully seize and recover more than 94,000 bitcoin that had been stolen from Bitfinex. The recovered bitcoin was valued at over $3.6 billion at the time of seizure."
https://www.coindesk.com/policy/2022/02/08/us-officials-seize-bitcoin-from-2016-bitfinex-hack/