Aerosmith frontman Steven Tyler has entered voluntary rehabilitation, forcing the Boston-based rock group to cancel the first part of their Las Vegas residency.

Tyler, now 74, is open about his struggle with substance abuse disorder throughout his entire life.

The band shared the following on Tuesday: “As many of us know, our beloved brother Steven had worked on his sobriety many years,” they posted on social media. He had foot surgery to prepare him for the stage, and was also required to manage pain during the procedure. Recently, he relapsed and has voluntarily entered a treatment program that will allow him to focus on his recovery and health.

The June and July Las Vegas shows of the band have been cancelled. The goal is to perform again in September, according to the band.

The band stated that they were “devastated” by the inconvenience caused to so many people, particularly loyal fans who travel long distances to see our shows.

The band offered refunds for cancelled shows.