||Theo [season 3+], played by Michael Ealy
Straus' best students, Theo is an expert hacker. He initially committed murders by finding people online who wanted to kill their coworkers, and then captured them. Wearing a mask, he would impersonate them, go on a killing spree, then return and fake his victim's suicide.
During one such spree, Theo was injured and found his way to Strauss' medical office. Recognizing a kindred spirit, Strauss took Theo in and taught him how to satisfy his urges.
Now Theo has a happy home with a wife and two children. He has a job that requires a lot of time on the road, and uses it as cover for more killing sprees.