Kings of Leon are cancelling the rest of their U.S. tour because vocalist Caleb Followill is suffering from vocal problems and exhaustion.

Promoter Live Nation announced the cancellation in press release Monday, three days after Followill left the stage in Dallas, Texas.

“We are sorry to say that Kings of Leon are canceling their entire US tour due to Caleb Followill suffering from vocal issues and exhaustion.”

Followill had walked off the stage mid-show in Dallas, saying he was “going to go backstage for a second, going to vomit, going to drink a beer, and going to come back out and play three more songs.” Yet he never returned. Followill’s brothers and band mates, Nathan and Jared, and cousin Matthew vowed on Twitter to replay the show. Jared also admitted the band has “internal sicknesses & problems” that go beyond dehydration. Then came news of this cancellation.

“The band is devastated, but in order to give their fans the shows they deserve, they need to take this break. Unfortunately, the U.S. dates cannot be rescheduled due to international tour dates on the band’s schedule.”

Purchased tickets will be refunded, and the band will resume touring in Canada on September 28.