Searchers comb canyon near Fallbrook for missing Marine wife San Diego County Sheriff's Department search-and-rescue teams combed a canyon near Fallbrook on Monday in hopes of finding a Marine wife missing since Friday. Meanwhile, a Camp Pendleton Marine believed the last person to see 22-year-old Brittany Dawn Killgore was arrested on suspicion of possessing a stolen assault rifle. "We believe there is a strong likelihood Brittany is the victim of foul play," said Sheriff's Lt. Larry Nesbit. Louis Ray Perez, 45, a Marine at Camp Pendleton, was questioned about Killgore's disappearance and was uncooperative, Nesbit said. On Sunday, Perez was arrested on suspicion of possessing a stolen weapon, an AR15 assault rifle. Brittany Killgore was last seen Friday wearing a dark purple evening gown, with purple floral glitter patterns, officials said. She filed for divorce last week from her husband of two years, according to court documents. Her cellphone was found in the Gaslamp Quarter, San Diego's shopping and entertainment district. Killgore's husband, Cory Killgore, deployed to Afghanistan, is on his way home because of his wife's disappearance, officials said. Perez is being held on $500,000 bail and set to be arraigned Wednesday. Tony Perry in San Diego Photo: Brittany Dawn Killgore. Credit: San Diego County Sheriff's Department