MINNEAPOLIS (WCCO) — A 57-year-old man died over the weekend after possibly drowning in a western Wisconsin lake.

The Polk County Sheriff’s Office says David Saleh, of Amery, Wisconsin, died Saturday evening after diving into shallow water on Bone Lake, located east of Luck.

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Saleh may have struck the bottom of the lake, investigators say. He was swimming with family members on Eagle Island.

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After Saleh didn’t regain consciousness, relatives loaded him into a pontoon boat and brought him to shore, where first responders provided treatment.

Emergency crews brought Saleh to a hospital, but he was soon pronounced dead.

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His exact cause of death is under investigation by the Polk County Medical Examiner’s Office.