By Dakin Andone, CNN

(CNN) — Tennessee plans to execute Byron Black on Tuesday for the 1988 murders of a woman and her two young daughters, despite concerns from his attorneys that a device implanted to restore his heartbeat could repeatedly shock him as he’s put to death.

The device – an implantable cardioverter-defibrillator, or ICD – is at the center of a court battle that has been unfolding for several weeks. Black’s attorneys want the device deactivated at or immediately before his lethal injection Tuesday morning.

If it isn’t, they say the effects of the lethal injection drugs will cause the ICD to shock Black’s heart, perhaps repeatedly, in an attempt to restore it to a normal rhythm. This will cause Black a prolonged and torturous execution, the attorneys argue, viola

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