He died that day -- July 30 , 1989 -- in Wyoming .
It 's been 20 years since a bull struck Lane Frost in the back at the Cheyenne Frontier Days Rodeo .
Lane Frost died that day -- July 30 , 1989 -- in Wyoming .
It 's been 20 years since a bull struck Lane Frost in the back at the Cheyenne Frontier Days Rodeo .