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