(Darke County, OH)--An arraignment is pending for a Darke County man accused of intentionally setting a fire that killed his own grandmother.  A six-month investigation has ended with charges of aggravated murder and arson against 36-year-old Jamin Brenner.  Brenner was taken into custody on Friday afternoon.  Investigators allege he set fire to a trailer in the Sherwood Forest Trailer Community that killed 86-year-old Beverly Lees in December of last year.