8-year-old meets his bone marrow donor for the 1st time

A.J., 8, was connected with Alex Momany through the Be the Match bone marrow registry.
2:11 | 09/20/17

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Transcript for 8-year-old meets his bone marrow donor for the 1st time
Finally tonight, America strong. We celebrated a milestone today for a member of our own family. Robin Roberts, marking her fifth anniversary of her life-saving bone marrow transplant. Robin's match, her sister, Sally Ann. But 70% of those people who need a bone marrow transplant don't find it in their own family, and that's where be the match comes in. And this morning, a boy named A.J. Meeting the stranger whw saved him. He was a really healthy boy. All of a sudden, in the middle of the night, he woke up with leg pain. And the following day, we had to take him to the E.R. On his fourth birthday, A.J. And his family received a life-changing diagnosis. We found out that it was actually leukemia. Reporter: Living overseas while dad Jeff served in the military, A.J. And his family immediately flew back to the states for treatment. A.J. Was so sick. The treatment was so intense. Reporter: Unfortunately, in the summer of 2015, A.J. Relapsed. At that point, we knew that a transplant was really his only option. Reporter: The family turned to be the match. And thankfully, they found A.J. A match. A 22-year-old woman. That's all the family knew at the time. Like a typical kid, A.J. Found small moments of joy in his toys and even dancing. A.j.'s mom, writing to her son's donor. I thank you from the very depths of my heart. Reporter: The transplant worked. A.J. Was cancer free. And now, meeting his donor for the first time, face to face. A.j.'s match, Alex. Reporter: Something you want to say to her? Thank you for saving my life. Not a dry eye for any of us watching this morning. We're rooting for A.J. And robin, happy fifth birthday. I'm David Muir. I hope to see you right back here tomorrow night. Until then, have a good evening. Good night.

This transcript has been automatically generated and may not be 100% accurate.

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