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