New details have emerged in the investigation of the deadly Newtown shooting that suggest the killer fed his obsession with violence by keeping meticulous records about mass murderers for years.

The New York Daily News reports investigators discovered, "a chilling spreadsheet 7 feet long and 4 feet wide that required a special printer, a document that contained Lanza’s obsessive, extensive research — in nine-point font — about mass murders of the past, and even attempted murders."

An unnamed law enforcement source who spoke with the Daily News said the giant spreadsheet was actually a "score sheet" and that Lanza, an avid video game player, hoped his attack would put his name at the top of the list of killers.

Read more at the Huffington Post