Police said the incident involved a couple living in the 900 block of Mahogany Run Drive, in the Falcon Point subdivision, about a mile and a half from Interstate 10 and the Grand Parkway. The woman apparently was involved in a relationship with the male victim, according to Caitilin Espinosa, spokeswoman for the Fort Bend County Sheriff's Office. Sheriff's officials said Friday evening that Gibson had been arrested and charged with aggravated assault and murder. A 41-year-old man was charged with aggravated assault after allegedly setting his girlfriend on fire in the Katy area on Thanksgiving Day, authorities said.