I highly suspect it was the other “personality disorder” that drove him to commit this, not Asperger’s. He was at the age when schizophrenia typically becomes pronounced.

Via Breitbart:

According to ABC News, Ryan Lanza, the older brother of 20-year-old Connecticut school massacre perpetrator Adam Lanza, has told police that his brother has Asperger Syndrome and another “personality disorder.” ABC News reports:

Neighbors described the younger man to ABC as “odd” and displaying characteristics associated with obsessive-compulsive disorder.