When Oskaloosa firefighters responded to a house fire Monday (6/21), they found a dead body inside.  Fire crews were called to 3046 Newland Way in rural Mahaska County around 9:50am about a house fire. When the fire was put out, firefighters discovered the body of 52-year-old Jeffrey Allen Fisher, who lived at the home.  It was also found that the fire had been intentionally set in at least six different locations in the building.  The preliminary investigation indicates Fisher died of a self-inflicted gunshot wound.  The investigation is continuing.