ABC News on Monday confirmed reports that Diane Sawyer will interview Bruce Jenner, announcing an air date of April 24.

The two-hour special, "Bruce Jenner -- The Interview," will feature what the network called a "far-ranging" talk with the Olympian, who has been the subject of long-standing reports that he is transitioning to womanhood. The interview will run as a special edition of ABC's ongoing news show "20/20."

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Over the past months, Jenner, 65 -- who won the gold medal in the decathlon at the 1976 Summer Olympics in Montreal and went on to become a sports commentator, motivational speaker, product endorser and infomercial entrepreneur -- has been wearing shoulder-length hair and affecting a feminized appearance, leading to widespread speculation he is undergoing some degree of transgender change.

While he has not spoken publicly about the reported transition, his mother, Esther Jenner, 88, hinted at it to The Associated Press in February, saying, "I never thought I could be more proud of Bruce when he reached his goal in 1976," she said, "but I'm more proud of him now. It takes a lot of courage to do what he's doing."

That same month, TheWrap.com reported that Jenner's representatives were in final negotiations with ABC News for the Sawyer interview. ABC had declined to comment.

According to trade reports, the cable network E! had been planning a reality-TV show built around Jenner and his transition, but Variety last month said it had confirmed the project was being suspended. Although E! had not acknowledged the existence of a series, Variety said in January that the development process had progressed far enough that E!'s head of publicity was planning to meet with the gay, bisexual and transgender rights group GLAAD to discuss respectful handling of the transition.