She was 91 years old.

Bobbie Nelson, Willie Nelson's sister and longtime band pianist, has died. The musician was 91 years old.

A founding member of the Willie Nelson's Family Band, Bobbie died on Thursday morning surrounded by family, according to a post on Willie Nelson's Instagram page:

A cause of death has not been released.

Having spent more than 50 years in the Family Band, Bobbie then decided at the young age of 76 to release her solo debut. Called Autobiography, the album was released in 2008 and included "12 Street Rag" and "Crazy."

 

Our thoughts and condolences go out to Bobbie Nelson's family and friends. Share your thoughts in the comments below.