Stacy Thedans remembers the last phone conversation she had with her mother on the morning of September 11, 2001.

Shelli Wright and her son, Graham Haggett, remember his grandmother Sandra Lee Wright, who was killed on September 11, 2001.

Umberto Joseph DeJesus talks to his wife, Nancy Cardona, about volunteering at Ground Zero.

Former World Trade Center Director and CEO Charles Maikish remembers John DiGiovanni, who died in the World Trade Center bombing on February 26, 1993.

Former NYPD lieutenant Bill Cosgrove remembers carrying Father Mychal Judge, the first official victim of September 11th, out of the World Trade Center.

Father Michael Duffy talks about how he came to give the homily at the funeral of his friend, Father Mychal Judge, the first official victim of the September 11, 2001 attacks on the World Trade Center.

Retired NYPD officer Joseph Lutrario remembers responding to the attacks at the World Trade Center on September 11, 2001.

Lee Hanson and his wife, Eunice, talk about losing three family members who were aboard United Airlines Flight 175 during the September 11 attacks.

Beverly Eckert remembers her husband, Sean Rooney, who died in the World Trade Center on September 11, 2001.

Michele Garcia and her husband, Frank, remember her son NYPD officer Robert Oswain, who patrolled the World Trade Center site shortly after September 11, 2001.

Barbara Cattano remembers her partner Alena Sesinova who was killed in the North Tower of the World Trade Center on September 11, 2001.

Granvilette Kestenbaum remembers her husband, Howard, who died in the World Trade Center attacks on September 11, 2001.

Gladys and Carolina de la Torre remember their older sister Azucena who was killed in the World Trade Center on September 11, 2001.

Jean Braca talks with her son David about losing her husband, Alfred Braca, on September 11, 2001.

John Romanowich, a recovery worker, remembers his first day at Ground Zero after September 11, 2001.

Jack Murray (R) went down to Ground Zero the day of the September 11 attacks. He tells his friend, Jud Esty-Kendall (L), about cutting steel so rescue workers could search for those buried in the rubble.

Antonia Landgraf and Matthew Gambale remember their sister, Giovanna "Gennie" Gambale, who died on September 11, 2001. Gennie worked at Cantor Fitzgerald on the 105th floor of Tower One. She was 27 at the time, and living near her parents' home in Brooklyn.

Andrea Doctor remembers her husband, Johnny Doctor Jr., who was killed at the Pentagon on September 11, 2001. Doctor was an information systems technician first class in the United States Navy.

Anita Korsonsky (R) remembers her sister, Jeanette Lafond Menichino, who died at the World Trade Center on September 11, 2001, in an interview with their mother, Dina Lafond (L).

Bernell Sutton remembers his wife, Claudia, who died in the World Trade Center on September 11, 2001.