As millions in Florida survey the catastrophic damage and flooding caused by Hurricane Milton, David Muir reports from St. Lucie County, where tornadoes hit multiple communities, and speaks with residents from Fort Pierce who experienced the twister firsthand; Mola Lenghi has the latest on the urgent rescue efforts underway at a Colorado tourist mine after authorities say equipment malfunctioned, leaving at least one dead; Martha Raddatz looks back at the life and legacy of Ethel Kennedy, the 96-year-old widow of Robert Kennedy; and more on tonight's broadcast of World News Tonight with David Muir.