NASHVILLE, Tenn. (AP) - Singer June Carter Cash, the wife and Grammy-winning duet partner of Johnny Cash, was hospitalized in critical condition Saturday as a result of complications from heart surgery, according to their longtime manager.

Cash, 73, had the surgery on Wednesday at Baptist Hospital to replace a valve, said Lou Robin.

He said Johnny Cash is asking everyone able to pray for his wife's recovery to do so at 10 a.m. CDT Sunday.

"June did this for him one time when he was critically ill," Robin said. "The recovery the next morning was something the doctors couldn't describe or imagine."

June Carter Cash is a singer, songwriter, musician, actress and author.

She and her husband have performed together on record and on stage, doing songs like "Jackson" and "If I Were a Carpenter," which both won Grammy awards for them in 1967 and 1970, respectively.

She also co-wrote Cash's 1963 hit "Ring of Fire," which was about falling in love with him.