Police now say the Aug. 6 murder-suicide in Pennsylvania that left two parents, three children, and their dog dead was committed by the father. Megan Short had reportedly called 911 about three weeks before the shooting to tell authorities she was afraid of her husband, Mark. A week later, the 40-year-old man bought a .38-caliber handgun and ammunition, investigators said. The day Megan planned to move out with her kids, Mark called the family into their living room and fatally shot her and their 8-year-old, Liana, and went on to kill their 5-year-old, Mark, and 2-year-old, Willow. One day earlier, police said, Mark Short had taken the three children to the nearby Hershey Park amusement park. Willow made national news as a baby for receiving a heart transplant and recovering from the arduous surgery.