The coroner in Las Vegas says there’s no evidence blues legend B.B. King was poisoned before he died of natural causes in May.

Clark County Coroner John Fudenberg said on Monday that an autopsy sought by two of the musical icon’s 11 adult children shows the cause of death was Alzheimer’s disease with other physical conditions.

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Daughters Karen Williams and Patty King alleged through their lawyer that King’s business manager, LaVerne Toney, and his personal assistant, Myron Johnson, hastened their father’s death.

Lawyers for King’s estate called the claims defamatory.

The coroner’s ruling closes the official investigations of King’s death.

He died May 14 at home in Las Vegas at age 89.