Cass County authorities says one man is dead and another hospitalized after suffering from carbon monoxide poisoning in an ice fishing house on Leech Lake. Emergency responders found one man dead and three others sick in the fish house on Walker Bay Sunday afternoon. Sheriff Tom Burch says the fish house was a converted camper trailer, and the initial investigation points to propane heaters in the structure that were not ventilated. Names of the men have not been released pending notification of family.