1Colt Gray [apalachee high school] 2Adam Lanza [sandy hook elementary] 3Kip Kinkel [thurston high school] 4Arthur Achlietner [graz school] 5Artyom Anoufriev [academy maniacs] 6Eric Harris [columbine high school] 7Nikita Lytkin [academy maniacs] 8Salvador Ramos [uvalde elementary school] 9Seung-Hui Cho [virginia tech university] 10Thomas Lane [chardon high school] 11Viktor Sayenko [dnepropetrovsk maniacs] 12Alyssa Bustamante [murder of elizabeth olten] 13Natalie Rupnow [abundant life christian school] 14Elliot Rodger [isla vista attacks] 15Jodi Arias [murder of travis alexander] 16Vladislav Roslyakov [kerch polytechnic college] 17Dylan Klebold [columbine high school] 18Igor Suprunyuk [dnepropetrovsk maniacs] 19Randy Stair/Andrew Blaze [weis markets] 20Pekka-Eric Auvinen [jokela school] 21Dylann Roof [charleston church] 22Nikolas Cruz [parkland high school]