The US Department of Justice (DoJ) said Bridges admitted to using a seized administrator account on Silk Road in order to lift Bitcoin from various accounts and deposit them into his own wallet. He then sold off the Bitcoin on the Mt Gox exchange between March and May of 2013 and came away with $820,000 in cash.

Bridges also admitted to lying to investigators and working to obstruct others who were investigating both Silk Road and his own actions.

Source: Ex-Secret Service agent who siphoned Bitcoin from Silk Road takes plea deal