The house party was filled with up to 20 young people who all fled when the gunman fired at least 20 bullets. Ivanov posted a picture of the rifle he used together with three bullets on Instagram just days before the attack. He also tweeted “First and last tweet. I’ve been through it all’ and ‘What’s Ruger gonna think?'” (thus making a reference to Ruger Firearms). The shooter and his girlfriend Anna Bui reportedly broke up last week. She was one of his victims. In total he killed three of his classmates from Kamiak High School: Jake Long, Anna Bui and Jordan Ebner.
Ivanov, engineer and founder of open source laser tag system Skirmos, was currently working at the Genius Bar for an Apple store and had previously worked as a sales associate at Abercrombie & Fitch. He was also actively involved with his startup Skirmos for which a Kickstarter campaign raised more than $90,000.