(Corvallis, OR) -- The Benton County Sheriff's Office is searching for a missing female kayaker after her companion was found dead in the Long Tom River near Monroe. Joseph Bendix and Mariana Dukes, both from Eugene, went kayaking on Saturday and didn't return. Bendix's body was found three miles south of Monroe. Around 50 volunteers are searching for Dukes. The Sheriff's Office is asking anyone who sees a green kayak downstream from Ferguson Road on the Long Tom River to contact them.