When that homeowner went to investigate, he saw a man he identified as an ex-roommate, Jeremiah Kellar, running from the side of his home. The homeowner was able to catch up to Kellar, and hold him until police arrived.
Kellar was apparently able to get away again, but Harris County deputies tracked him down a few blocks away.
Kellar was charged with arson to a habitation and booked into the Harris County Jail.
