A Michigan jury was shown a chilling video of school shooter Ethan Crumbley at a firing range. Surveillance video captured the then 15-year-old practicing with the 9mm handgun that his parents gave him for Christmas. Four days later, he used the same weapon to kill four students at Oxford High School. The disturbing video was shown at the trial of Crumbley's mother, Jennifer. She���s the first parent to stand trial for killings committed by their child and denies the charges against her..