After being diagnosed with Parkinsonism, Steuart Smith is retiring as lead guitarist for the Eagles. The 72-year-old musician, who has acted as the “Hotel California” band’s co-lead guitarist for almost 25 years alongside Joe Walsh,

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.

The musician who has served alongside Joe Walsh for 24 years as the Eagles’ 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.