(Portland, OR) -- Today marks 15 years since Kyron Horman went missing from Skyline School in Portland. The Multnomah County Sheriff's Office says the case remains open and District Attorney Nathan Vasquez has assigned a team to put new eyes on the investigation. Kyron was taken to school by his stepmother Terri Horman who stayed with him during a science fair. Kyron never made it to his class, and he was marked absent. Terri Horman was investigated but never listed as a person of interest. Massive targeted searches were conducted, but no sign of Kyron Horman was found.