Think you know the person you married? Think again.

Wives and husbands shockingly betrayed by the people they trust the most.

When marriages fall apart, divorce can turn ugly -- even deadly.

Discover how married couples can lead dark and twisted lives.

Delve into the dark side of female connections and rivalries.

People recount their true stories about living with evil family members.

Host Holly Madison unveils a bold series where sex appeal meets true crime.

Discover three polygamous families torn apart by lies and savage killings.

Was Kathleen Peterson's death a terrible accident or murder?

Candice DeLong profiles the world's most notorious female killers.

Passion turns to rage in these twisted and doomed love stories.

Stalking victims share their emotional stories in intimate interviews.

Paula Zahn unravels shocking crimes interviewing those closest to the case.

Chilling tales of neighbors who turn home sweet home into home sweet hell.

Every suspect shares a last name in these homespun murder mysteries.

Stories of obsession and murder in the name of love.

Stalking victims of extreme obsession tell their stories of survival.

Romantic encounters take dangerous turns and change the course of lives.

Sometimes a murder is so well orchestrated, it's hard to crack the case.

The truth becomes a strange puzzle when killers don't act alone.