ROCHESTER, Minn. – The state fire marshal has been unable to identify what caused a northwest Rochester house fire that left a woman dead in late March. There was an explosion of a medical-grade personal oxygen tank, but there likely was already a fire, investigators said. An autopsy blamed the death of Patricia Lynn Spitzack-Haylish was due to physiologic stress that worsened a chronic heart obstruction. There was no reason to suspect foul play, the fire marshal said.
