Police have identified the gunman responsible for killing 50 people and injuring 400 others in a shooting late Sunday night in Las Vegas. The man has been identified as Stephen Paddock, a 64-year-old man from Mesquite, Nevada. The shooting is the deadliest mass killing in US history. He opened fire on a country music festival from the 32nd floor of the Mandalay Bay Resort and Casino. He was later found dead from a self inflicted gunshot to the head. Authorities are still gathering information about Paddock and working to determine his motive.