Murder + Horrific = Murderific. 

Mark Orrin Barton was a day trader with a checkered past. He was also studying with the religion, the Jehovah Witnesses, The Atlanta day-trader spree killer killed his family, then casually strolled into work to kill his coworkers. 

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Sources-
https://criminalminds.fandom.com/wiki/Mark_Barton

https://www.washingtonpost.com/wp-srv/national/longterm/workshooting/stories/atlanta31.htm

https://www.chicagotribune.com/news/ct-xpm-1999-07-30-9907300107-story.html