Internet account believed to be Adam Lanza's shows early obsession with mass murder

The Hartford-Courant has found (but not revealed the name of) an online account believed to have belonged to Newtown school shooting gunman Adam Lanza. In posts on gun message boards, activity in gaming chat rooms, and Wikipedia edits, that user "showed a technical prowess about weapons and computers, a 'fetish' for a certain bullet and a near-fixation with correcting Wikipedia articles about mass killers." If that's Lanza, as authorities say, he was 17 years old at the time of the posts.

Related: Watch the February 2013 Frontline PBS documentary "Raising Adam Lanza."