1. October 1 2017 Mandalay Bay Vegas Shooting

2. at least 58 people killed, the police said, and 515 injured, either by gunfire or in the flight to safety
A lone gunman perched on the 32nd floor of the Mandalay Bay Resort and Casino, had smashed the windows of his hotel suite with a hammer, taken aim at a crowd that the police said numbered 22,000 people, and committed one of the deadliest mass shootings in American history.
The gunman had two rifles, outfitted with scopes, set up on tripods in front of two big windows, said the first official. 

4. The police identified the gunman as Stephen Paddock, 64, a retiree with no significant criminal history
Stephen Paddock
“He has no military background or anything like that,” he added. “He’s a guy who lived in a house in Mesquite and drove down and gambled in Las Vegas.”
He said Stephen Paddock had recently texted him to ask how their mother was faring after Hurricane Irma.