Lary Harmon operated a crypto mixer called Helix from 2014-2017 where he was responsible for completing 356,000 Bitcoin transactions.
Lary later pleaded guilty for helping launder nearly $300 million via his crypto mixer.
US Fed arrested Lary and seized all his cryptocurrencies that were worth millions.
In April 2020, IRS agents realized Bitcoin had disappeared from the addresses they had seized.
The judge ordered Lary to hand over the seedsphrase to authorities to transfer the remaining funds that were worth $40M at the time to a secure wallet.
Lary later informed the police that the culprit was his brother Gary who lived across the hall from Lary.
Gary was arrested in July 2021, on money laundering and other crimes.