CASSELBERRY, Fla. -- A mother shot and killed her son, and then herself, inside a Casselberry Gun Range Sunday afternoon, according to police. When Casselberry police arrived at the Shoot Straight Gun Range on South U.S. Highway 17-92 (see map) just after 4:00pm, they found two people had been shot in an apparent murder-suicide. Police identified the man as 20-year-old Mitchel Moore. The shooter, his mother, was identified as 44-year-old Marie Moore. Eyewitnesses said the pair was acting strangely and then the woman ran out of the room to get more ammunition. When she returned, eyewitnesses said, she shot her...