For 17 years, Kathy Swanson feared her son, Michael, would one day harm someone. For 17 years, she tried in vain to convince people that something about Michael was different until that dreadful day finally came that her worst nightmare came true.

William Knorr's mother, Theresa, always threatened that if she ever went to jail for what she had done, she would take him down, too. After years spent helping her keep the horrors secret, could he ever escape or would he wind up like all the others?

As a child, Pam Jacobs spent years of her life on the run from the law. But she had no idea that her father, Charles Sinclair, was a wanted man until the day the FBI caught up with them.

When James Henslee realized that he was the police's prime suspect, he couldn't believe it. How could James convince them that someone else someone he had once looked up to was the one capable of murder?

Ronald and Patty had always seen the signs that their older brother, Bernard Eugene Giles, had a darker side, but when Gene finally let loose the monster lurking inside, they couldn't help but wonder how things had gone so wrong.

When Clare Bradburn's ex-husband, Ed, suddenly confessed to his crime after 26 years, she thought she finally had justice, and that the nightmare she had been living for decades would end. She never expected that her nightmare would just continue.

When Tim Kreider discovered proof that his son, Alec, was responsible for a horrific crime, he knew what the right thing to do was. But his instincts as a father told him something else. How far should a father go to protect his child?

When Elizabeth Flores was a child, her sister, Louise, tried to shield her from a horrible family secret. But when Louise met David Turpin, that all changed. How did Louise go from running from monsters to becoming one herself?

When Corey Breininger was a child, his stepmother, Judith Hawkey, coerced him into doing something horrible. Tormented by guilt, he kept her secret for years. Knowing what she was capable of, how could he ever tell the truth and hope to survive?

Days before Thanksgiving, a small Philly suburb is rocked by the murder of 67-year-old Alice Hufnagle. Investigators run down a litany of suspicious characters on the road to unmasking the beloved matriarch's killer.

In 2005, a 28-year-old photographer and college student is found murdered in his Arlington, Texas apartment. Investigators suspect that the victim's generosity and willingness to help those in need may have lead a killer to his door.

In December 1998, the body of telemarketing manager David Stevens is found in a torched car in La Jolla, California, the victim of homicide. Detectives encounter a rogue's gallery of suspects and outlandish leads on their way to finding the killer.

A young woman is found murdered in her Portland, OR apartment on Christmas Day and investigators soon learn the terrifying truth about her vicious killer.

Not all serial killers are the same. Some kill for pleasure, others for reward. Cult killer Robert Rozier stalks Miami. He and his associates murder and mutilate on their master's orders. But one fateful mistake will bring Rozier to justice.

Fired from his job as a fashion writer, Peter Braunstein vows to take revenge on the fashionistas who snubbed him. Posing as a firefighter, he kidnaps a co-worker and terrorizes her for 16 hours before leading detectives on a multi-state chase.