Geneticists studying Lanza's DNA for insight into school shooting
CNN Chief Medical Correspondent Dr. Sanjay Gupta said it is unlikely investigators will be able to find a genetic clue for what motivated Lanza, who fatally shot 26 people, including 20 children, in the attack on Sandy Hook Elementary School in Newtown, Connecticut on December 14. Lanza, who had also killed his mother before the school massacre, took his own life with a gunshot to the head.
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