Home Society A timeline of the deadliest mass shootings in recent U.S. history A Las Vegas shooting left at least 59 people dead and over 500 people injured. Here is a look at the deadliest U.S. mass shootings in recent history. International Business Times October 3, 2017 10:28 IST Close A Las Vegas shooting left at least 59 people dead and over 500 people injured. Here is a look at the deadliest U.S. mass shootings in recent history.