index," emotional night on "dancing with the stars," for valerie harper. Just stepping on that ballroom floor inspired so many. And she was dancing her heart out. We talk to valerie and her PARTNER,... See More
index," emotional night on "dancing with the stars," for valerie harper. Just stepping on that ballroom floor inspired so many. And she was dancing her heart out. We talk to valerie and her PARTNER, tristan MacManus. Our fourth week of competition, the couple leaving right now is -- valerie and tristan. Reporter: Valerie harper left with an attitude of gratitude. It has been wonderful. Completely unique, like nothing else in the world. Reporter: When did you start to feel that maybe your time on "dancing with the stars" was coming to an end? Oh, the first dance. ♪ I was so happy I didn't fall opening night and break something, you know? ♪ Reporter: Last night's top score of 27 was a three-way tie. Corbin bleu's paso doble. Elizabeth berkley's tango. And amber riley's tango. ♪ you just carry on. I am not in pain. ♪ when we first started working together, my daughter said, do you have a headache? Is it memory problems? Well, yes. But -- over time. Then -- truth was revealed. When you have cancer, and they say you have three months, in january, and it's suddenly october, you've got to feel good about that. And you know, the drugs I'm taking, which I just took, before our interview, and I'm speaking perfectly well. Are working right now. We'll see what goes. Everyone should live like that, one day at a time. Reporter: She leaves the show with warm memories. And backstage -- a memory from when valerie was 20 years old. We have a clip of you in the 1959 "li'l abner." Oh, no. Reporter: I would love to know, what advice would valerie today give valerie then? Just keep dancing. ♪ Reporter: For "good morning america," cameron mathison, abc news, los angeles. Keep dancing. Keep smiling. Monday night, at 8:00, 7:00 central. Very fun to watch.
This transcript has been automatically generated and may not be 100% accurate.