Adam Lanza was such an ardent fan of mass murderers that he kept a massive spreadsheet detailing their "accomplishments." Investigators searching the home Lanza shared with his mother found a 7-foot long, 4-foot wide spreadsheet—apparently printed using a special printer—listing roughly 500 past shooters, including their names, the number of people they killed, and the make and model of their guns, a cop briefed on the findings tells the New York Daily News. "They don't believe this was just a spreadsheet," he says. "They believe it was a score sheet."
Investigators hypothesize Lanza thought of the list as a video game high score list he was trying to beat, and that he chose the elementary school because, in the words of the source, it was "where he could rack up the greatest number of kills." It's also why ultimately Lanza turned the gun on himself: "In the code of a gamer, even a deranged gamer, if somebody else kills you, they get your points." Investigators also found 2-year-old photos of Lanza posing with guns, holding a pistol to his own head. "He had this laid out for years before," the cop says.