Devon Arthurs, 19, was arrested after leading police to the bodies of his two roommates at his Tampa, Fla., home last May. He has pleaded not guilty, but during interrogation, he said he acted because Atomwaffen members were plotting attacks.

Devon Arthurs, 19, was arrested after leading police to the bodies of his two roommates at his Tampa, Fla., home last May. He has pleaded not guilty, but during interrogation, he said he acted because Atomwaffen members were plotting attacks.