Killer Instinct with Chris Hansen

Colorado mom Tammy Tatum is brutally murdered right beside her one-year-old daughter, Sadie. Now 24, Sadie reveals to Chris Hansen the shocking truth -- 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 to reveal the identity of the killer.

Detectives searching for Walter Sartory believe he's been kidnapped and is being held hostage for his fortunes. Chris Hansen investigates the race against time to find the brilliant but troubled scientist before it's 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 Colorado to discover the shocking truth behind her murder.

Poker club owner Paul Horn is gunned down in his apartment. He made some deadly enemies, and detectives reveal four suspects. Chris Hansen investigates which one took the ultimate gamble and pulled the trigger.

After being threatened by a friend's partner, Susan Bauer is found murdered in her own Minnesota home. It appears to be an open and shut case, but Chris Hansen discovers there is much 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 unfolds the horrific truth of which one of them murdered Sophia and why.

The investigation of the tragic 1999 disappearance of Hannah Hill in in Akron, Ohio, spans nearly 13 years before her family gets justice. Chris Hansen discovers it was a heartbreaking case of a young woman's trust betrayed.

The mysterious death of an antiques dealer leads detectives on a case that would span nearly 20 years. Chris Hansen follows a twisting trail of forensic evidence, potential suspects and multiple confessions to find the killer.

The body of Daavid Campbell is found tortured, strangled and floating in a pond in Illinois. Chris Hansen explores three motives for the murder: love, money and revenge. Soon, the horrifying and shocking truth is revealed.