In this undated photo provided by the San Juan County Sheriff's Office is William Atchison. A 21-year-old gunman who disguised himself as a student to get into a New Mexico high school where he killed two students had caught the attention of U.S. investigators more than a year ago, authorities said Friday, Dec. 8, 2017. Atchison, a former student at small-town Aztec High School, had legally purchased a handgun at a local store a month ago and planned the attack, authorities said. (San Juan County Sheriff's Office via AP)
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