Willie Nelson is apparently having some breathing problems.
We hope he's okay.
Sadly, the concert was for a charity event for the Dumb Friends League in Castle Pines Village.
Organizers at the event made the announcement right before Willie was supposed to go on. They said:
"[Willie is] suffering from breathing problems due to the high altitude and emphysema."
The classic country singer, who's pushing almost 80, was taken to a hospital where he was treated.
We wish him the best and hope he feels better soon!
[Image via Arnold Wells/WENN.]