Singer/songwriter Willie Nelson performed during the 2012 CMT Music Awards rehearsals at Bridgestone Arena on June 6, 2012 in Nashville, Tennessee. (Photo by Rick Diamond/Getty Images for CMT)
DENVER -- Willie Nelson was supposed to play at a fundraiser in Castle Pines, Colo., on Saturday. But the 79-year-old singer had to cancel.
KUSA-TV reports that organizers told the audience Nelson was suffering "from breathing problems due to the high altitude and emphysema" and was taken to a nearby hospital.
"I was told Willie woke up and had trouble breathing, so he was taken to the hospital," fundraiser host Fred Bartlit told the Denver Post.
Nelson is scheduled to perform at the House of Blues in Dallas on Tuesday.