A calm maniac.
Steven is actually a mastermind at killing. He is calm, but his mind is very far off. If you were to meet this man on the road, you would think that he is a good guy. He makes jokes, he is very intellectual, and he can be emotional. When he becomes emotional is when you will see his crazy side. He will sit and wait for day's on end for something to go perfectly. He is very meticulous about how his looks are and his surroundings.
Steven only carries a pen with him.
Steven first discovered his OCD in the second grade. He was taking his first standardized test, and his pencils were not the same length and could not start the test until they were. Since this time, everything must be perfect for Steven. His parents really liked it, because he would always keep his room (and the house) clean.
When Steven got to the fifth grade, he discovered that he enjoyed to watch things suffer. Normal children like to put salt on a slug. Steven made a line of food, and at the end was a large salt block, and when the snail climbed on it, it slowly melted away.
In the sixth grade, Steven hurt his first human being. He was playing tetherball with a "friend" of his. When his friend "cheated" by holding onto the ball and not fessing up to it, Steven quickly and meticulously tied the child up on the post with the rope on the ball. The child was there for 4 hours until the next recess when the teacher noticed him. Steven had already called his mom "sick".
In the 10th grade was when there were serious problems with Steven. Steven was starting to get gray hairs, and a friend started to make fun of him. Steven sat still for about 5 minutes, slowly spinning the pencil he had in circles, and suddenly lashed out and stabbed the friend in the leg, narrowly missing the main artery in it. Steven chillingly leaned over and said "the next time, I won't miss" and left. He was later expelled from school.
Steven never went back. He turned 22, and that's when everything started to go wrong. After getting his GED, he went to college, and graduated with a masters degree much earlier than he should have (he was 26 when get got his masters).
After graduating, he was teaching a class (specifically Psychology. He double majored in Psychology and Sociology), and all the students would not stop moving. During the next session, he closed the doors and conducted an experiment on his students, to see what effects would happen when they were faced with imminent death. From under his podium, he pulled out a military grade machine gun, and saw the reactions of the students. One student attempted to seize the gun from Steven and he shot him. Chaos occurred, with many students trying to run out the door that was locked. He shot and killed all of them. The only ones that survived were those that remained sitting (according to Steven the ones with the "strongest minds").
He was obviously swiftly arrested, and put in jail where he sits now, in a high security prison in Connecticut. He is 34 years old.