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Mother-of-two kills her estranged husband's new girlfriend then shoots their son, nine, and daughter, five, in grisly murder suicide after anonymous post appeared online saying her ex's lover would 'get what she deserved'
- Details emerge in Thursday shooting spree that left four dead in South Carolina
- Shooter Jessica Edens accused her estranged husband of an affair for past year
- Shot dead Merideth Rahme, 28, as she parked her car outside his apartment
- Edens went on the run in SUV with children ages five and nine in back seat
- Mom and her kids all found dead two hours later with gunshots to the head