Dwone Anderson-Young, 23, was shot to death on June 1, 2014, outside his home in Seattle’s Leschi neighborhood. Anderson-Young and a friend, Ahmed Said, had spent the evening at R Place on Capitol Hill and were found together at the scene.

Investigators say the suspect, Ali Muhammad Brown, targeted Said and Anderson-Young using a cell phone app commonly used by gay men to meet others. Brown, who described himself as a strict Muslim and a self-proclaimed jihadist, later admitted to these murders and to killing another man in Skyway during a spree he said was motivated by anger over U.S. foreign policy.

The killings raised particular concern because the victims were selected through a dating app and because Brown framed his actions in extremist and vengeful terms. Anyone with information about Anderson-Young, his movements that night, or contacts who might have known him is urged to come forward.