Heather Callahan

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When Heather Callahan was 27 years old, she was savagely attacked by a stranger outside her Denver, Colorado, home. The man struck from behind and stabbed her five times in the chest. "It's a miracle today that I'm here," she says.

With support from the Denver Center for Crime Victims, Heather says she was able to move forward with her life. The moment Heather received $1,000 from Oprah, she knew she wanted to give back to the people who showed her such kindness 13 years ago.

After the show, Heather reached out to the Denver Center for Crime Victims. That's when she heard the story of Martha Clark, a woman whose boyfriend shot her in the face at point blank range.

For three years, Martha says she put up with constant abuse from her boyfriend, Thomas McBride. Then, on Christmas Eve in 2005, he walked into her bedroom, put a shotgun to her face and pulled the trigger. He was sentenced to 48 years in jail for first-degree attempted murder.