In 2000 for the body of Stephen Schulhoff was found beaten to death with a baseball bat. His daughter Courtney, 16, and her boyfriend are found guilty and sentenced to life with no parole. But who swung the bat?

In 2000 for the body of Stephen Schulhoff was found beaten to death with a baseball bat. His daughter Courtney, 16, and her boyfriend are found guilty and sentenced to life with no parole. But who swung the bat?

November 2001 in Fort Worth, Texas. Lloyd and Agnes Courtney were beaten and stabbed to death by their daughter, Deborah Pieringer. Prosecutors say it was for money, but she says she didn't do it.

November 2001 in Fort Worth, Texas. Lloyd and Agnes Courtney were beaten and stabbed to death by their daughter, Deborah Pieringer. Prosecutors say it was for money, but she says she didn't do it.

New Year's Eve in Pampa Texas ends in triple homicide. Twila Busby and her two adult sons are found dead in their home. Her boyfriend Hank Skinner is later found guilty. He says he's innocent. Candace DeLong wants to find out the truth.

New Year's Eve in Pampa Texas ends in triple homicide. Twila Busby and her two adult sons are found dead in their home. Her boyfriend Hank Skinner is later found guilty. He says he's innocent. Candace DeLong wants to find out the truth.

In two months, 20 patients at a Texas hospital are murdered. Nurse Vickie Jackson, on duty at every attack, is sentenced to life with no parole. She now says that she's innocent and knows who the real killer is.

In two months, 20 patients at a Texas hospital are murdered. Nurse Vickie Jackson, on duty at every attack, is sentenced to life with no parole. She now says that she's innocent and knows who the real killer is.

A night ends in tragedy when Stefan Andersson is bludgeoned to death by girlfriend Ana Trujillo and her 5 inch stiletto heel. She claimed self-defence but a jury found her guilty of murder. Candace Delong wants to know what turned her into a killer.

A night ends in tragedy when Stefan Andersson is bludgeoned to death by girlfriend Ana Trujillo and her 5 inch stiletto heel. She claimed self-defence but a jury found her guilty of murder. Candace Delong wants to know what turned her into a killer.

Teenager John Katehis is convicted of stabbing newsman George Weber to death after meeting him through a Craigslist advertisement offering sex for money.

Teenager John Katehis is convicted of stabbing newsman George Weber to death after meeting him through a Craigslist advertisement offering sex for money.

In Jacksonville, Fla., Alexandra Tobias is found guilty of shaking her baby to death while playing an interactive game; now, Candice DeLong digs deeper to find out what made Tobias snap.

In Jacksonville, Fla., Alexandra Tobias is found guilty of shaking her baby to death while playing an interactive game; now, Candice DeLong digs deeper to find out what made Tobias snap.

Earl Linebaugh and Melissa Harris are found guilty of murdering an elderly woman and her caretaker during a 1995 home invasion, but Harris says she was victimized by ex-boyfriend Linebaugh.

Earl Linebaugh and Melissa Harris are found guilty of murdering an elderly woman and her caretaker during a 1995 home invasion, but Harris says she was victimized by ex-boyfriend Linebaugh.