This week, Martha sits down with CEO and Founder of Tunnel to Towers Foundation Frank Siller who tells his late brother’s story of courage and selflessness as an FDNY Firefighter on the day of the 9/11 terror attacks.

Frank shares how he organized a nearly 500-mile Never Forget Walk to commemorate 20 years since September 11th, 2001 and what this anniversary means to him and his family.

Follow Martha on Twitter: @MarthaMacCallum