Jessica Lynn Lopez , 25 , pleads not guilty to a murder charge in San Diego County . Brittany Killgore 's body is found in a rural part of neighboring Riverside County . Luis Ray Perez , 45 , who was on a date with Killgore when she was last seen alive a week ago , was charged earlier this week with two felonies unrelated to Killgore 's death -- receiving stolen property and possession of an assault weapon -- and he has pleaded not guilty , authorities said . - May 11 : Another Marine is also being investigated in the case , authorities say .
Jessica Lynn Lopez , 25 , pleads not guilty to a murder charge in San Diego County . Brittany Killgore 's body is found in a rural part of neighboring Riverside County . - May 11 : Another Marine is also being investigated in the case , authorities say .