Video: Dennis Murphy previews two-hour 'Twisted'

Dateline NBC

'Dateline NBC,' the signature broadcast for NBC News in primetime, premiered in 1992. Since then, it has been pioneering a new approach to primetime news programming. The multi-night franchise, supplemented by frequent specials, allows NBC to consistently and comprehensively present the highest-quality reporting, investigative features, breaking news coverage and newsmaker profiles.

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