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In Longmont, CO, Tammy Tatum is brutally murdered right near her one-year-old daughter, Sadie. Now 24, Sadie reveals to Chris Hansen the shocking truth... that the killer was someone she knew her entire life.

The brutal shooting of Stephen Perret looks like a mob hit. Police have little evidence, but soon discover Stephen made a call just before he was murdered. Chris tracks down the person Stephen called... who reveals the identity of his killer.

Detectives searching for wealthy scientist Walter Sartory believe he's been kidnapped and is being held hostage for his fortunes. Chris Hansen discovers that investigators were in a race against time to find Walter before it was too late.

College senior Susannah Chase had everything to live for, but just a few days before Christmas she was brutally attacked only yards from her home. Chris Hansen travels to Boulder, Colo., to discover the shocking truth behind her murder.

Detectives identify four suspects in poker club owner Paul Horn's shooting murder; Chris Hansen investigates which one took the ultimate gamble and pulled the trigger.

After being terrorized and threatened by a friend's partner, Susan Bauer is found murdered in her own home; it appears to be an open-and-shut case for detectives; however, Chris Hansen discovers there is more to this story than first meets the eye.

The body of 20-year-old Sophia Arnold is found on the banks of the Mississippi River; police interview two men whose stories don't match up; Chris Hansen strives to discover which suspect murdered Arnold and why.

In Akron, Ohio, the investigation into the 1999 disappearance of Hannah Hill spans nearly 13 years before her family gets justice; Chris Hansen examines the heartbreaking case of a young woman's trust being betrayed.

In Henrico, Va., detectives investigate the mysterious death of an antiques dealer in a case that will span nearly 20 years; Chris Hansen follows the trail of forensic evidence, suspects and multiple confessions to find the victim's killer.

David Campbell is tortured, strangled to death and dumped in a pond; Chris Hansen explores three motives for his murder, including love, money and revenge.