(Portland, OR) -- An 18-year-old man faces manslaughter charges after a fatal crash on Sauvie Island. The Multnomah County Sheriff's Office says 18-year-old Ayden Heard was driving a side-by-side utility vehicle on private property just after midnight Sunday when it crashed and rolled over. A juvenile female passenger died at the scene. Heard was treated at a hospital and then booked for manslaughter, driving under the influence and reckless driving.