Kristin Marino lost her father Kenneth, a firefighter, on 9/11. David Muir shares the touching moment his FDNY colleagues showed up for Kristin on her wedding day — and brought dad to the wedding. ––– Subscribe to ABC News on YouTube: https://abcnews.visitlink.me/59aJ1G ABC News is your daily source of breaking national and world news, exclusive interviews and 24/7 live streaming coverage. Download the ABC News app for the latest headlines and alerts: https://abcnews.go.com/devices Watch 24/7