A Nashville medical examiner ruled Thursday that country singer Tammy

Wynette died from natural heart failure, according to the Associated

Press. The singer, who died in 1998, was exhumed as part of a $50

million wrongful-death suit brought by her daughters, who claim Wynette

became addicted to narcotics because of inappropriate medical treatment.

Although drugs were found in Wynette's body, examiner Bruce Levy said

it was impossible to determine whether they played a role in Wynette's

death, the AP reported.