Two of B.B. King’s daughters, Karen Williams and Patty King, are alleging that two of the late musician’s closest aides sped up his death by poisoning him, according to a report from the Associated Press on Monday.

The heirs reportedly say that family was kept away from King in his final days while personal assistant Myron Johnson and business manager LaVerne Toney administered poison to him.

“I believe my father was poisoned and that he was administered foreign substances,” say affidavits from both daughters, obtained by the AP from the daughters’ lawyer Larissa Drohobyczer.

“I believe my father was murdered,” they go on.

King died May 14 in hospice care at the age of 89. Johnson was present, though no family members were.

Toney has worked with King for 39 years and is named in King’s will as executor of a large estate.

Patty King’s affidavit says she saw Johnson place two drops of an unknown substance on his tongue for several months leading up to his death.

Lt. Ray Steiber told the AP on Monday that the Las Vegas homicide detectives are investigating the case, without divulging any futher details.

Attorney Brent Bryson, who is representing King’s estate, denied the claims.

“I hope they have a factual basis that they can demonstrate for their defamatory and libelous allegations,” he told the AP.

Williams and Patty King aren’t the only of King’s 15 children to raise concerns over Toney. Another daughter of the blues legend, Shirley King, told KLAS-TV that Toney wouldn’t allow them to see their father in his final months.

“Just getting through this day is killing me,” she told KLAS-TV. “Why would she not let me see my daddy before he leaves this earth?”

Memorials for the late singer are scheduled later this in Memphis, Tenn., and Indianola, Miss.