PHOENIX (AZFamily) — The Maricopa County Office of the Medical Examiner has released its report into the April death of a disabled group home patient in Phoenix.

The report states that 50-year-old William Henry Miller’s primary cause of death was likely an irregular heartbeat linked to hardened arteries, but environmental heat exposure and other medical conditions, including a long-term brain condition, may have played a role.

Temperatures at the time were around 100°F.

Miller died on April 10 after being left unattended in a van outside his group home. His caretaker, Nuru Niyonkuru, was arrested and charged with vulnerable adult abuse.

Court paperwork revealed that Niyonkuru admitted to drinking a small bottle of Crown Royal before his shift and was supposed to take Miller to an ap

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