His wife said that he passed away in his sleep.

My husband passed in his sleep in our Nashville home.

He was recovering from heart surgery in July and looked forward to getting back on the road in January.

GALLERY: Stars We Lost in 2016: ALL CROPS: 113279932 BERKELEY, CA - SEPTEMBER 1977: Leon Russell performs at the Greek Theater on September 4, 1977 in Berkeley, California. (Photo by Ed Perlstein/Redferns/Getty Images)

Credit: Ed Perlstein/Redferns/Getty Images

We appreciate everyones love and support.

My darling Leon Russell passed away last night, he wrote.

He was a mentor, inspiration and so kind to me.

Thank God we caught up with each other and made The Union.

He got his reputation back and felt fulfilled.

I loved him and always will.

In July 2006, Russellsuffered a heart attackand later underwent bypass surgery.