Transcript for Video of bride dancing at wedding with ill father goes viral
Finally tonight here, America strong. A father, a daughter and a promise kept. Ever since she was a little girl, Mary Roberts and her father Jim would dance to this Lee Anne Womack song, "I hope you dance." ??? I hope you dance ??? Reporter: Their plan, to dance to it on her wedding day. They did not expect Jim would be diagnosed with cancer. He was still determined to keep his promise. And just before new year's, he escorted his daughter down the aisle. Point clear, Alabama. And after the wedding, the dance. And the song they always listened to. ??? I hope you still feel small when you stand beside the ocean ??? Reporter: Jim in a wheelchair, it hardly mattered. Father and daughter on the dance floor, just as they had always planned. Mary Bourne with a twist and a hug and a promise kept. And her father, singing the words. ??? I hope you dance ??? Reporter: Tonight, the video has been seen nearly a half million times. And Mary Bourne telling us she's thankful more people are praying for dad because of it. So many prayers for her father and for the beautiful bride. Thank you for watchinere tonight. I'm David Muir. I hope to see you right back here tomorrow. Until then, good night. Night.
This transcript has been automatically generated and may not be 100% accurate.