It was a marriage of opposites and yet somehow Debbie Kelly and Lars Itzo made it work. Then, Debbie was shot dead in the dark of night. Was her death a case of mistaken identity or the bloody end to a marriage gone bad? (43:54)

Nicole Pietz was a well-liked fitness executive married to the man of her dreams. Then one night, she didn’t show up for dinner with her husband and friends. Had Nici’s troubled past caught up with her or did someone want to harm her? (43:54)

It’s a gripping case that defies easy answers and Dateline has been following it for more than a decade. At the center, Steven Avery. He and his nephew were convicted of killing Teresa Halbach. Two sides. One truth. Who will you believe? (43:54)

It’s a true Hollywood whodunit. A show business stuntman was shot four times and left to die. Investigators uncovered a love story gone wrong and a villain with a dark secret. But the most stunning twist of all is what didn’t happen. (43:54)

A talented, young art student was murdered. The killer left no fingerprints and no DNA. Police zeroed in on three fellow students and, soon, the dark portrait of a killer began to emerge. (01:27:36)

When the wealthy heir to a legendary hotel is murdered, the list of possible suspects is long. He had his share of enemies, and a complicated family. Investigators soon learned someone close to the victim was also in danger. (43:54)