MINNEAPOLIS (WCCO) – Authorities in northern Minnesota say a 56-year-old man drowned Saturday while trying to save his dog in a watered-filled mining pit.

Gary Paternoster, of Buhl, died shortly after 6 p.m. after he was recovered from the Buhl pit, the St. Louis County Sheriff’s Office said.

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While Paternoster still had a pulse when he was pulled from the water, he was pronounced dead at a Hibbing hospital not long after.

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The sheriff’s office says Paternoster entered the pit at the end of State Street in an attempt to rescue his dog, who’d been caught on something in the water.

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Paternoster’s death is under investigation.