Aug. 5 (UPI) -- Tennessee is set to execute death row inmate Byron Black on Tuesday despite raised concerns about his implanted heart device which could cause a "prolonged and torturous execution."

Black was convicted 37 years ago for killing Angela Clay and her two daughters, 9-year-old Latoya and 6-year-old Lakeisha.

Black's attorney, Kelly Henry said, that his "execution carries so many risks."

"He is elderly, frail, and cognitively impaired; there's no principled reason to move forward with this torturous procedure." As his heart implant will continue running throughout his execution," Henry said.

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