Caitlyn Jenner's best friend and manager Sophia Hutchins has died in a quad bike accident after plunging 350ft down a cliff. The 29-year-old's ATV is believed to have struck the bumper of a moving car and was thrown down a ravine. It is not yet known if Caitlyn Jenner witnessed Hutchins' crash or was at home at the time of the tragedy on Wednesday. Find out more on DailyMail.com #jenner #death #news #kardashian #california