"The Unusual Suspect" Airs Friday, January 23 at 10pm/9c
When two mothers and their teenage daughters are murdered in a suburb of Maryland, investigators must answer a terrifying question: is this the work of a serial killer? As police search for clues, they find that a master thief holds the key to solving the mystery. Dennis Murphy reports (NEW).
VIDEO PREVIEW: http://www.nbcnews.com/dateline/preview-unusual-suspect-n290476
"The Mystery Man" Airs Sunday, January 25 at 7pm/6c
A woman looking for love meets Mr. Right. But when her whirlwind romance morphs into a mind-bending mystery with government agents, cryptic messages and international spies, she launches a secret mission of her own to uncover the truth. Dennis Murphy reports (NEW).
David Corvo is the senior executive producer, Liz Cole is the executive producer and
Lester Holt is the primary anchor of "Dateline" (Fridays at 10pm/9c). Follow "Dateline NBC" on Facebook and Twitter @datelinenbc.