Tom Frost, who lost his beloved daughter Lisa in the 911 attacks, explains how their relationship and his faith have kept him positive in the face of this unspeakable tragedy.

Lisa Anne Frost was 22 years old and from Rancho Santa Margarita, California. Lisa was a passenger on United Airlines Flight 175.
Lisa had just graduated first in her class at Boston University and was flying back to Orange County to visit her parents. On September 11, 2001, at 9:03am, United Airlines Flight 175 crashed into the southern facade of South Tower of the World Trade Center, impacting between the 77th and 85th floors.
A year after the attacks, a sheriff's deputy came to the family's home and told Tom Frost that DNA testing had confirmed that some of Lisa's remains had been discovered.
In the end, a bone fragment, a skin-tissue sample, part of the right hip, and part of a collarbone were found. They were cremated.
"I like to talk about Lisa it keeps the memory in me," said Tom. "If you don't the memories just fade. I don't want Lisa to fade away."

Lisa's name on the 9/11 National Memorial, New York.