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Friday, Jan. 29: A reporter's journey for justice

When it comes to solving a crime, time is the enemy. As the years pass, memories fade, the trail grows cold, life moves on. This is the story of a murder that, after seven years, might never have been solved. The victim - a new mother - had been forgotten by almost everyone - except a complete stranger determined to find justice.

NBC's Lee Cowan brings you the story of the man "Behind the Badge."

See it on Dateline Friday at 9 p.m. ET, 8 p.m. CT on NBC.