PlugwalkJoe, aka Joseph James O’Connor, a UK citizen connected to the 2020 Twitter hack affecting many high-profile accounts, including Elon Musk, Joe Biden, Barack Obama, and Apple, has pled guilty to cyberstalking and other crimes. On Tuesday, the Department of Justice (DOJ) announced that O’Connor has been extradited to the US.

In some instances, the co-conspirators took control themselves and used that control to launch a scheme to defraud other Twitter users. In other instances, the co-conspirators sold access to Twitter accounts to others. O’CONNOR communicated with others regarding purchasing unauthorized access to a variety of Twitter accounts, including accounts associated with public figures around the world. A number of Twitter accounts targeted by O’CONNOR were subsequently transferred away from their rightful owners. O’CONNOR agreed to purchase unauthorized access to one Twitter account for $10,000.

PlugwalkJoe also took over an unnamed TikTok user’s account in 2020, and the details listed suggest the unnamed victim is top TikToker Addison Rae.

“O’Connor used his sophisticated technological abilities for malicious purposes — conducting a complex SIM swap attack to steal large amounts of cryptocurrency, hacking Twitter, conducting computer intrusions to take over social media accounts, and even cyberstalking two victims, including a minor victim,” US Attorney Damian Williams for the Southern District of New York says in a statement.