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‘Making a Murderer’ lead investigator speaks out for first time on Dateline

03:25

The Emmy-winning true-crime documentary, "Making a Murderer" transfixed millions of viewers and fueled a debate over the guilt or innocence of two convicted killers, Steven Avery and Brendan Dassey. Dateline, which has been following the case for more than a decade, gives TODAY an inside look on the latest findings including the first ever television interview with co-lead investigators, Tom Fassbender.