Authorities say a man who set a Detroit house on fire committed suicide after learning that the arson killed an 80-year-old woman with Alzheimer's disease.
Detroit TV station WDIV says it obtained police records showing that Mark Gardua took responsibility for the June 8 fire in a suicide note. He wrote, "I did not know anybody was home at the time. I am truly sorry." Gardua shot himself.
The house was next to a home where Gardua's mother lived. The victim was Helen Roberts. A nephew, Dustin Bean, lived with Roberts, but he was not home at the time.