The recent hacking into the Capital One database which is the largest breach in US history was allegedly done by a 33-year-old trans woman and software engineer named Paige A. Thompson. Thompson also threatened to “shoot up” a California social media company and was living in a house-turned-arsenal with a convicted felon who had once been arrested for being part of a “contract murder plot,” federal court papers in Seattle revealed.

Thompson was arrested Monday for allegedly hacking into a server rented by Capital One and obtaining the data of more than 100 million people.

It was not clear if any of the information Thompson allegedly snatched was passed to third-parties. She was charged with one count of computer fraud and abuse and faces up to five years in prison and a $250,000 fine.

Quan was arrested the same day after police raided his “modest” home and found in his bedroom “what can fairly be described as an arsenal of weapons, ammunition, and explosive material,” the court papers state.

Among other things, police found “several assault rifles, a sniper rifle, and hand guns,” the papers state. “Some of the guns were loaded, including one with a high capacity magazine. Further, some of the guns appears to be illegal firearms.”

On the social media site, Slack, a user by the name “Erratic,” and who was allegedly Thompson, in June boasted about having files taken from Capital One, according to the criminal complaint against her.

In a separate Twitter message obtained by the FBI, Thompson also described the Capital One hack as a suicide mission.

“I’ve basically strapped myself with a bomb vest,” Thompson wrote on June 18, according to court documents. “F–king dropping capitol ones dox and admitting it.”

Thompson also regularly shared details of her life on other social media sites as well, from information about her cat, Millie, to talking about her desire to kill herself. In one tweet claimed she was planning to travel to Denmark in October for legally assisted suicide.

It was a veterinarian letter Thompson posted on July 19 with her home address that ultimately led FBI agents to her door.