Today marks the third anniversary of the deadliest mass shooting in US history. On the night of October 1st, 2017, 58 people died after a gunman opened fire from his hotel room -- on the 32nd floor of Mandalay Bay resort in Las Vegas -- sending more than a thousand rounds into a crowd gathered for the Route 91 Harvest Music Festival. This morning, a remembrance ceremony was held outside the Clark County Government Center.