Firefighter and 9/11 hero Bob Beckwith has died at age 91. Beckwith was already retired when the World Trade Center was struck, but he put on his gear and joined the search for survivors. In 2001, Pres. George W. Bush, with his arm around Beckwith, spoke to first responders at Ground Zero in NYC, just three days after the attack. #DavidMuir reports. #WorldNewsTonight #WNT #DavidMuir #News #ABCNEWS #National