SONORA (CBS13) — An ATV rider was killed after crashing in Sonora on Tuesday, authorities say.

California Highway Patrol says, a little after 2 p.m., Richard Allen Smith, 81, of Sonora, was riding an ATV on his property. While going up a hill, it appears the ATV stalled and started to roll backward.

READ MORE: Sacramento County Tackles Zip Code Vaccine Disparities

Smith tried to turn the ATV, but he was soon ejected and hit a tree. Officers say the ATV also rolled over and landed on top of Smith.

READ MORE: Feds' Boogaloo Indictment Details Inside of Northern California Extremist Group

Medics responded to the scene but Smith was soon pronounced dead, authorities say.

MORE NEWS: Stockton Teen, 14, Shot While Driving Left Paralyzed

Investigators say Smith was not wearing a helmet at the time.