Conn. school shooting probe ends with gunman's motives unknown
But the report on the Dec. 14 shooting rampage at Sandy Hook Elementary School in Newtown, Conn., described Lanza's "obsession with mass murders" especially the shootings in 1999 at Columbine High School in Colorado. Lanza, 20, was also fascinated by firearms, and investigators found a check from his mother to buy a pistol as a Christmas gift, according to the 44-page report.
The report portrays 20-year-old Lanza as a troubled man who "knew his conduct to be against the law. He had the ability to control his behavior to obtain the results he wanted, including his own death."
The investigation included a search of the Lanza home and interviews with those who knew him.
Lanza, who had been estranged from his father and older brother for about two years, kept a spreadsheet of mass murders that included information about each shooting.
According to the report released Monday, Adam Lanza would not allow anyone to enter his bedroom, refused to sleep in hotels, reacted badly to loud noises, disliked Christmas and birthdays and liked to play a video game called "Dance Dance Revolution" in addition to more violent fare.
Nancy Lanza was concerned her son had not traveled anywhere for three months and "would only communicate with her by email."
While the large informal memorials that arose in this town of 27,000 residents in the days after the shooting have long been removed, small commemorations are sprinkled throughout the sprawling town.
Connecticut passed sweeping changes to its gun laws but a similar effort failed in the U.S. Congress. Lanza used a Bushmaster rifle, a Glock pistol and a Savage Mark II rifle in the shootings.
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