Grant Thompson -- the creator and star of the viral YouTube series "King of Random" -- died this week after a paragliding accident ... according to his family.
The Washington County Sheriff's Office says a report came in Monday of an overdue paraglider, who'd gone off the radar near the Sand Hollow State Park. They say the caller reported the paraglider should have returned an hour earlier, and he couldn't be reached on his cellphone. The call triggered a massive search.
Grant's coordinates were pulled from GPS data, and a helicopter located his body that night. WCSO says detectives found paragliding equipment at the crash site, as well as a video recording device ... which they're reviewing to determine cause.
Grant started his YouTube channel in 2010, documenting experiments, life hacks and random weekend projects. King of Random amassed more than 11 million subscribers and nearly 2.5 billion views total.