Diane Sawyer scored the first interview with Bruce Jenner about his current transition from male to female.

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A family member confirmed last week that Jenner is in the process of a gender transformation, which he is filming for an upcoming documentary series for E!.

But that process will also be shared with ABC News viewers through an interview with Sawyer, ABC News sources told multiple media outlets.

"Diane has always been very supportive of the LGBT community," a source told Us Weekly. "She has been honored by GLAAD."

The decision to have a sit-down interview with ABC instead of NBC could cause some strife with E!, which is owned by NBCUniversal.

The interview is expected to air in May.