Connecticut School Shooting: What set Adam Lanza off? (VIDEO)

(CBS) NEWTOWN, Conn. - Many questions remain about the identity and the psychological state of Adam Lanza, the young man who went on a shooting spree Friday morning at Sandy Hook elementary school. Senior CBS Correspondent and former assistant director of the FBI John Miller offers some possible answers.

Pictures: Conn. elementary school shooting

Miller reports friends of Adam Lanza told CBS News that he was "socially awkward and in some cases, he made people uncomfortable who didn't know him well."

Miller also notes that the alleged shooter does not appear to have a Facebook or online identity and seemingly kept to himself.

Miller speculated that "the problems between [Adam] and his mother resulted in her murder and then he set off to kill the other thing in her life that she loved."

Complete coverage of the Sandy Hook Elementary School massacre