Dateline: Secrets Uncovered

She was a beaming bride. It was a haunting death. Sarah and Ryan were newlyweds when she drowned in the bathtub. Did she die of natural causes or was it deliberate? It took three trials to find the truth.

It all began when a bestselling author found his wife at the base of the stairs. Was this a fall or was it a crime? The story made headlines and we've been covering it for more than a decade. Here, Michael Peterson answers our questions.

A woman is murdered in a home invasion. Then, her best friend and neighbor is shot the following night. Investigators unearth disturbing secrets that suggest the cases may be linked.

When Cathy Torrez never came home after work, her family feared the worst. An intensive search ended after her car was found, with her body in the trunk. Who would commit such a savage crime? It take years to get to the truth.

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.

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?

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?

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?

When a young woman is found brutally murdered, investigators start to lose hope when they believe that the case is unsolvable, but the victim's mother is determined to get justice and figure out what happened to her daughter.

A young man from small town Indiana heads to Japan where he falls for a beautiful woman from a land nearly as far away. Then, one of the biggest natural disasters in history hits. With whole towns being wiped out, would they survive?

It was a crime not even police could believe: A toddler was shot in the head and left for dead. Despite the odds, she stunned everyone with her will to survive while a detective vowed to crack this case, no matter how long it took.

When Debbie Hawk vanished, her friends and family were left searching for answers. Investigators discovered that before she went missing, Debbie planned to reveal secrets. Police wondered if silencing her was a motive for murder.

A dedicated Air Force Captain who had been deployed overseas for long stretches found himself caught in the crossfire of a love triangle at home. Investigators discovered a tale of obsession and passion. Who pulled the trigger?

When Bonnie Craig was found dead, police collected DNA but it didn't match anyone in the system. Then, twelve years later, there was a hit but the man was thousands of miles away. Turns out, prosecutors would need more than DNA to convict a killer.