The cause of death for a zookeeper who appeared on the notorious documentary series Tiger King: Murder, Mayhem, and Madness has been revealed.

Erik Cowie died from acute and chronic alcohol use in Brooklyn, New York, Julie Bolcer, a spokesperson for the NYC Office of Chief Medical Examiner, confirmed.

His death has been determined as natural, according to Bolcer.

Cowie was found unconscious on Sept. 3 in an apartment in East Flatbush and was pronounced dead on the scene.

Cowie worked alongside Joe Exotic at the G.W. Exotic Animal Memorial Park in Wynnewood, Oklahoma. He continued to take care of tigers after Exotic was arrested until he eventually surrendered the animals to the Department of Justice.

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