NBC joins ABC, CNN, MSNBC and E! Entertainment in offering the ceremony live. It's set for 10 a.m. PDT (1700 GMT) Tuesday at Los Angeles' Staples Center.
NBC had initially planned only a one-hour prime-time special on Tuesday night, but said Sunday it would also cover the event live. It was not immediately clear who would anchor.
Charles Gibson will anchor coverage for ABC, which is setting aside its typical daytime programming.
CNN has seen its ratings soar with the Jackson story, and it will show the memorial on the main network and HLN (formerly Headline News). CNN International will air the ceremony to the rest of the world. Anderson Cooper, Larry King and Don Lemon are the anchors for CNN coverage. Robin Meade, A.J. Hammer and Jane Velez-Mitchell will anchor at HLN. CNN en Espanol also will cover it.
Chris Jansing will anchor live coverage of the memorial on MSNBC. Fox News Channel hadn't announced its plans.
E! Entertainment will cover the ceremony on its television network and its Web site.
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