Diane Sawyer will conduct a two-hour interview with Bruce Jenner that will air on Friday, April 24, ABC said.
ABC said the former Olympic champion and patriarch of the Kardashian television clan will give a "far-ranging interview."
Jenner has been looking more feminine in appearance, but he has not spoken publicly about it or about speculation that he is transgender. In an interview earlier this year with The Associated Press, his mother did not challenge speculation that he is preparing to live as a woman.
There has been talk about a reality show that discusses Jenner's transition, but the E! Entertainment network that carries Kardashian programming has not commented about it. The Sawyer interview has been rumored for several weeks, but ABC didn't talk about it until Monday.
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The interview will air at 9 p.m. on April 24.