A gunman seen carrying an assault rifle killed four people, including a police officer, when he opened fire in broad daylight in New York City, before taking his own life. He gunman was identified as 27-year-old Shane Tamura from Las Vegas. Tamura was a former high school football player with a history of mental health issues, before he traveled across the country in the days leading up to the shooting, according to the NYPD Commissioner. It was also revealed that the gunman had recently been fired as a security guard at a casino in Las Vegas. This is a developing story - get the latest updates at DailyMail.com #breakingnews #Lasvegas #NYC #newyork #killer #cops #attack