Marine Arrested in Brittany Killgore Murder A Marine already charged with illegal possession of an assault rifle was arrested today on suspicion of murder in the killing of Marine wife Brittany Killgore. Staff Sgt. Louis Ray Perez, 45, was arrested on the new charge at Vista Detention, where he is being held. Killgore, 22, of Fallbrook, Calif., disappeared April 13, after telling friends she was going out in San Diego's Gasslamp district. Her body was found four days later, dumped near Lake Skinner in Riverside County, Calif. Jessica Lopez, 25, was already charged with first degree murder in Killgore's death. She entered a not guilty plea in court April 19 and was ordered held on $3 million bail, the San Diego County Sheriff's Department said. According to legal records, Lopez once lived with Perez, who had been considered a person of interest in the case since the investigation into Killgore's disappearance began. Police had said they believed he may have been the last person to see Killgore alive. is being investigated and has not been cooperative in his interview, according to Lt. Larry Nesbit of the San Diego Sheriff's Office. Perez was arraigned April 18 on an unrelated charge of possession of an AR-15 assault rifle and was ordered held on $500,000 bail. The slain woman's grandmother, Cheryl Coble, told the Park Hills Daily Journal in Missouri that Killgore, Perez and his girlfriend were supposed to go on a dinner cruise the night of April 13, but the girlfriend backed out. Killgore told friends she was going to spend the evening in San Diego's Gaslamp Quarter. However, authorities said they believed she never made it. Killgore filed for a divorce from her husband, Cory Killgore, also 22, just days before she disappeared. Cory Killgore returned from Afghanistan last week following the news of his wife's disappearance.