The man suspected of shooting and killing at least 50 people Sunday evening at a concert in Las Vegas has been identified as Stephen C. Paddock, a 64-year-old Nevada resident. According to reports, Paddock lived in a retirement community in Mesquite, about 80 miles northeast of the Strip. In a 5:45 a.m. PT press conference, police confirmed they have located his companion, named as Marilou Danley, who also shares his residence, and that she is out of the country. Officials confirmed the gunman was dead when police arrived and believe he died of a self-inflicted wound. Paddock allegedly opened fire from a window on the 32nd floor of the Mandalay Bay hotel and casino, across from where the outdoor Route 91 Harvest Music Festival was taking place. Authorities said they believed Paddock had been in the hotel room since Sept. 28. At least 50 people were killed and more than 200 others are injured. Fire officials say some 400 were transported to hospitals.