Carbon monoxide poisoning is being blamed in the death of 24-year-old Ashley G. Speer, of Glenwood City, Wis.

The victims were occupying a boat on the St. Croix River near Bayport, over the weekend, when the accident occurred, authorities said Monday.

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Speer was pronounced dead at the scene while two men also on the craft were hospitalized Sunday after they fell ill, according to the St. Croix County Sheriff’s Office in Hudson, Wis.

Justin M. Roskos, 25, of Hastings, and Hayden L. Johnson, 27, of River Falls, Wis., are being treated at Hennepin County Medical Center. Roskos, the boat’s owner, is in critical condition, while Johnson is in satisfactory condition, a hospital spokeswoman said Monday afternoon.

“Initial investigation indicates this is a probable carbon monoxide poisoning incident,” a statement from the Sheriff’s Office read. “However, the investigation is ongoing.”

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