At 9:59 a.m. on Sept. 11, 2001, the South Tower collapsed. It’s also when New York firefighter Stephen Siller lost his life responding to the attack. Now, the Tunnel to Towers Foundation donates mortgage-free homes in Siller’s name to the families of fallen first responders and military members.

Source: ‘He will forever be in my home’: Marine plane crash widow receives mortgage-free home on 9/11 | 11alive.com