A 25-year-old bull rider from Missouri died after he was bucked off during a competition, according to reports.

Mason Lowe, a top-ranked competitor, sustained fatal injuries Tuesday night when he was flung from the bull at the National Western Stock Show in Denver, Colorado, news station WFOR reported.

Witnesses said the bull stomped on Lowe’s chest after he bucked off at the Denver Coliseum event. Lowe then reportedly got up, took a few steps and collapsed, according to WFOR.

The Professional Bull Riders (PBR) organization confirmed Lowe’s death in a tweet.

“We are deeply saddened to report that Mason Lowe passed away this evening following injuries sustained at the PBR event in Denver,” CEO Sean Gleason tweeted. “The entire PBR and National Western sports family extends our heartfelt condolences and deepest sympathies to Mason’s wife Abbey and his family.”

The organization said Wednesday it was accepting donations to help Lowe’s family.