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Professional bull rider Stormy Wing, from Dalhart, Texas, sports a tribute sticker to fallen rider Mason Lowe before competing in the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum on Jan. 16, 2019. Lowe, 25, from Exeter, Mo., was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

Professional bull rider Cody Nance, left, takes a moment to collect his thoughts before competing in the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum on Jan. 16, 2019. Fellow rider Mason Lowe, 25, from Exeter, Mo., was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

National Western Stock Show President and CEO Paul Andrews, left, listens to Professional Bull Riders CEO Sean Gleason talk during a news conference at the Denver Coliseum Jan. 16, 2019.

DENVER, CO - JANUARY 16: Professional bull riders take to the arena for the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum during January 16, 2019. Fellow bull rider, Mason Lowe, 25, from Exeter, Missouri, was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition at the Denver Coliseum January 16, 2019. (Photo by Andy Cross/The Denver Post)

Professional Bull Riders CEO Sean Gleason talks during a news conference at the Denver Coliseum Jan. 16, 2019.

Professional bull rider Daniel Tinsman of Farmland, Ind., takes a moment to pray before his ride in the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum on Jan. 16, 2019. Fellow rider Mason Lowe, 25, from Exeter, Mo., was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

Professional bull rider Stormy Wing, left, from Dalhart, Texas, sports a tribute sticker to fallen rider Mason Lowe before competing in the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum on Jan. 16, 2019. Lowe, 25, from Exeter, Missouri, was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

Professional Bull Riders CEO Sean Gleason talks during a news conference at the Denver Coliseum on Jan. 16, 2019. PBR bull rider Mason Lowe, 25, from Exeter, Mo., was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

Professional bull rider Derek Kolbaba, from Walla Walla, Wash., left, puts a tribute sticker on fellow rider Chase Robbins of Marsing, Ind., before the riders competed in the PBR Denver Chute Out Bull Riding Finals at the Denver Coliseum Jan. 16, 2019. The sticker is for fellow rider Mason Lowe, 25, from Exeter, Mo., who was killed Tuesday evening by a bull that landed on his chest during the PBR Chute Out competition.

Professional bull rider Ryan Prophet, from Rigby, Idaho, bows his head during a tribute to fallen rider Mason Lowe, 25, before the PBR Denver Chute-Out finals Wednesday at the Denver Coliseum at the National Western Stock Show on Jan. 16, 2019. Lowe was killed during Tuesday evening's event by a bull that landed on his chest.

National Western Stock Show President and CEO Paul Andrews speaks during a news conference at the Denver Coliseum on Jan. 16, 2019.