FAIRFIELD, Calif.—Three people, including an active duty Air Force member, have been arrested in the killing of a 19-year-old woman who was last seen leaving a Halloween party over the weekend in Northern California, police said. Leilani Beauchamp, of Carmel, was seen leaving a party Saturday in Sacramento with two Air Force members who share a Fairfield home, Fairfield Police Lt. Jausiah Jacobsen said in a statement. Police arrested Jessica Quintanilla, 21, on suspicion of murder charges, and her brother Marco Quintanilla and Juan Parra-Peralta on accessory to murder charges. Marco Quintanilla, 27, was also charged with violating his parole for a felony conviction for attempted murder, Jacobsen said. Jacobsen said investigators determined Beauchamp was killed at the Fairfield home and her body was then abandoned in Salinas, where she was found Sunday after the three were arrested. Parra-Peralta, 20, is an airman 1st class assigned to the 60th aerial …