The sideman who has served alongside Joe Walsh for 24 years as the Eagles’ touring co-lead guitarist, Steuart Smith, has officially retired from the group, taking his leave midway through the group’s stint at Sphere in Las Vegas.

According to the Cleveland Clinic, Parkinsonism is an umbrella term that refers to several brain conditions — including Parkinson’s disease — that cause slowed movements, rigidity (stiffness) and tremors. Parkinson’s disease makes up about 80% of all Parkinsonism cases.

Steuart Smith, the longtime touring guitarist for legendary rock band the Eagles, has retired because of health issues.