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Input: Atchison was also the subject of a 2016 FBI investigation after he made “generic comments” in an online gaming forum  said the special agent in charge in  Albuquerque  Terry Wade . It’s unclear what those exact comments were.
The FBI checked databases and interviewed Atchison and his family in March 2016  but ultimately closed the investigation when it determined no crime had been committed.  Wade  said Atchison didn’t have a gun at the time   he  told agents  he  had no plans for an attack and  he  didn’t have any ties to any organizations.
On Thursday morning  Atchison entered the 900-student school with multiple magazines on  him  and went to a bathroom. Student athlete Francisco Fernandez  18  walked in and was immediately shot by Atchison. The gunman then walked into the hallway and encountered Casey Marquez  17  also a student athlete  and killed her  according to officials.
 He  then walked up and down the hallway  firing randomly and into classrooms  before shooting  himself .
Investigators searched  his  home and  his  computer following the shooting. They found a paper with scratch notes in the trash can that had “work  packup  prep  walk  die” written on it  according to KOB 4. They also found a thumb drive on his person that included electronic notes that offer more evidence the attack was planned  officials said.

High school shooter posed as student to carry out attack