Willie Nelsonis canceling upcoming tour dates due to health concerns.
Alison Krauss was scheduled to perform alongside Nelson at many of the stops.
I am sorry to have to cut the SLC show short tonight, he told fans on Twitter.
Credit: Rick Kern/WireImage
The altitude got to me.
I am feeling better now & headed for lower ground.
Nelson released his latest album,Ride Me Back Home, earlier this summer.
His tour schedule can be foundon his website.
It remains unclear if all the appearances listed will be canceled.
A representative for Nelson did not immediately respond to EWs request for comment.
This post has been updated with additional details.
