Details about the teenaged gunman responsible for the latest mass shooting have emerged. Santino Legan, 19, opened fire Sunday at a garlic festival in Gilroy, California. He was shot dead by police after killing three people, including a 6-year-old boy, and wounding 12 others. Police acted swiftly, bringing down the shooter within 60 seconds. Stephen Romero, 6, was the youngest victim. Stephen's distraught father rushed to the hospital and was told the tragic news.