The 17-year-old driver of a minivan filled with illegal immigrants fell asleep at the wheel, causing a rollover accident in Utah that killed at least one passenger, authorities said. The accident happened Tuesday on a remote road often used to transport illegal immigrants. Fifteen people from Guatemala and Mexico were packed into a vehicle that normally seats seven or eight, authorities said. The young driver, also an illegal immigrant, was found walking along the road about a mile away and was taken to a juvenile prison, authorities said. Two people in the van were hospitalized in critical condition.