Alexandra Pesic was disturbed when she received a copy of a true crime book in the mail with chilling passages highlighted. She was even more frightened when a passage came to life.

After Jennifer Blagg disappeared from her Colorado home, investigators discovered her husband, Michael Blagg, was hiding shocking secrets.

Dean "Dino" Pantazes and his wife Clara appeared to have the perfect marriage, but Dino was leading a secret double life that he'd stop at nothing to protect.

Maple Batalia, a beautiful 19-year-old college student, was on the cusp of realizing her dreams when she was shot and stabbed to death after leaving her campus library. 

Terry Rouse grew up with a tight-knit family, but when the 24-year-old disappeared suspicions that the disappearance could have been caused by one of their own broke the family apart.

Family and friends saw the warning signs before Maple Batalia's murder in an upcoming episode of Killer Relationship.

Cathy Lamb was found brutally beaten to death by her husband Jeff Lamb on June 15, 2004.

Ina Gross, 78, was found in a pool of blood in the garage of her Florida home, but the investigation would lead to a surprising killer. 

Nikki Halpin was beaten to death in her Florida home as her two young sons cowered in fear. 

Keiona Braxton was elated about her pregnancy, but the mom-to-be would die just months into the pregnancy at the hands of a violent killer who left her for dead inside her own apartment.