When you let two teenagers share room at a treatment facility it is important that they match.
The murderer in this case did suffer from Asperger's syndrome. It calls for a very structured days if you want to avoid panic attacks which can develop into assault on staff and other patients.
Poor Mr. Gaulin did suffer from attention deficit disorder which results in a behavior which is unstructured, inability to focus and to keep to a routine.
Mr. Gaulin could unknowingly have provoked the attack by just being himself. It is a stern warning for those residential treatment facilities which are willing to take all kind of problems in. They must see to that patients who have illnesses where they cannot deal with other persons, can be offered a one person room, so they don't start fighting other patients.
It was by no mean any fault by Mr. Gaulin that he was placed in a room where he could risk an attack while dealing with his illness. It was a fault the facility made.
The murderer had a parole hearing in 2009. He was denied parole. Hopefully they continued his treatment in jail, so he knows what he is serving time for.
References:
Victims 2000- 2004 (Fornits Home for Wayward Web Fora Wiki)
WINDOW TEEN FACES SLAY RAP (by William J. Gorta and Leah Haines, New York Post, October 10, 2002)
New York: Upper Nyack: Student Charged In Fatal Plunge (By Lisa W. Foderaro, New York Times, October 10, 2002)