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411: The Edmonton security guard was unhappy at being involuntarily celibate. On July 31, 2016, he stomped a homeless man to death. He was found guilty of manslaughter and robbery and sentenced to four years in jail. William Atchison murdered two students at a New Mexico high school.
WILLIAM ATCHISON – 2017
411: Atchison, 21, shot two students to death at Aztec High School in Aztec, N.M. on Dec. 7, 2017. He was a former student at the school and killed himself as cops closed in. Students are evacuated by police from Marjorie Stoneman Douglas High School in Parkland, Fla., on Wednesday, Feb. 14, 2018, after a Nikolas Cruz, inset, alleged opened fire. (Mike Stocker/South Florida Sun-Sentinel via AP)