Deputies said Clayton Everley was digging a hole outside his home. The 7-year-old's parents found him buried and tried CPR before using their own defibrillator.
He was eventually airlifted to a Seattle hospital, but doctors couldn't revive him.
Jake Kelly will always remember his friend.
"We would always go riding out on the track over there on my four-wheeler and he'd ride his dirt bike. He would come over our house a lot and hang out and stuff," Kelly said.
Neighbors told Action News that Clayton has been dirt bike riding for several years and did it competitively. He would ride in his backyard.