In 1995, singer Madonna attracts the attention of a dangerous man who comes knocking on her door.

On July 18, 1989, Rebecca Schaeffer is killed by an obsessed fan who had been stalking her for years; an in-depth look at the life of actress Rebecca Schaeffer.

Hollywood director Steven Spielberg became the target of violent, drug-induced stalker Jonathan Norman who stalked Spielberg's house with handcuffs and a rape-kit; courtroom illustrator Mona Shafer Edwards discusses the courtroom drama.

The story of a woman gripped by the fantasy that she was romantically involved with David Letterman; a glimpse into the mind of a delusional woman suffering from the devastating condition of schizophrenia, and the story of her tragic demise.

Artist on the rise Christina Grimmie makes a name for herself on "The Voice" and YouTube, but has no idea that a man toils away in silence, contemplating a deadly strike.

Actress Gwyneth Paltrow tried to protect herself and her family from a relentless stalker who traveled across country to get close to her; Gwyneth's personal head of security provides exclusive insight into the private life of the terrified star.