The Boy Who Killed His Twin

In May 2010, wealthy married couple, Dennis and Merna Koula, were found shot dead in their Wisconsin home. There was little evidence from the crime scene, but one clue - computer keystroke - became critical. And one person who knew the couple very well would become the prime susp ...  Show more

In August 1996, Janet Levine March disappeared without a trace and her case remained unsolved for years. Her husband, Perry March, claimed she left home after an argument and never returned. However, investigators and Janet’s family believed he killed her. Over the years, Perry m ...  Show more

Jennifer Pan’s lies were finally unraveling—and she was desperate to regain control. When her parents discovered the truth, she didn’t beg for forgiveness. She planned their murder. In this episode, we follow the investigation, the shocking confession, and the trial that stunned ...  Show more

A brutal murder, lots of suspects, and conflicting evidence... but the forensics were clear on one thing: The killer knew his victim. And that alone gave investigators a head start.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ...  Show more

Nathan Matthews murdered his 16-year-old stepsister Becky Watts—then helped her family search for her. In Part 2, we break down the failed cover-up, the forensic clues that exposed him, and how the truth about one of Britain’s most disturbing family murders finally came to light. ...  Show more

He was America’s youngest serial killer—and his most brutal crime was still to come. In Part 2, we follow the murder that sealed Jesse Pomeroy’s fate, the investigation that exposed a disturbing pattern, and the historic trial that forced the country to confront how young is too ...  Show more