An 18-year-old woman has suddenly disappeared. Three weeks later, her remains are found in a make-shift grave. During their investigation, detectives find Kelly's online journal, which reveals a teenage love triangle full of conflict.

In Texas, a young mother disappears, leaving her infant daughter alone in the house. Days later her body is found burned in a remote part of town. Suspicion falls on the husband, but there may be another killer in their midst.

The parents of a 29-year-old women alert police when she goes missing. Investigators focus their attention on the victim's estranged husband, but friends say there was another man in her life.

Tim Permenter finds his girlfriend, Karen Pannell's lifeless body lying in a pool of blood. Police see a clue on a wall near her body written in blood, the word "Roc". But did Karen write the words herself?

29-year-old Summer Baldwin is found dead inside of a suitcase. Surveillance shows a man buying the exact same suitcase Summer would later be found dead in. As detectives build their case, they learn Summer might not be his only victim.

A millionaire, his wife, and their daughter are all found shot to death in their California home. With a long list of potential suspects, investigators spend three years analyzing every piece of the puzzle and make an arrest that shocks everyone.

The body of Jennifer Myers is found in her art and frame shop. Investigators determine the 44-year-old mother of two died of multiple gun shot wounds. With little evidence, detectives soon uncover an alarming link between Jennifer and her killer.

Dana Satterfield is found strangled to death in the back room of her beauty salon. A solid alibi clears Dana's husband of any suspicion. As other leads are exhausted, the case turns cold -- until an individual comes forward with a dark secret.

A four-year-old boy runs to his church and tell volunteers his grandparents are "melting." Police find the boy's great-grandparents dead from shotgun blasts. Detectives spend several days reviewing suspects until a tip breaks the case wide open.

One morning, a church employee arrives to work and trips on a woman's body. The pastor of the church suspects it could have been a random killing. Further questioning leads detectives to suspect another member of the church.

The murder of family man Ronald Whitehead is disguised as a carjacking. A long trail of clues leads detectives back to Ronald's doorstep with a member of his family suspected of masterminding the killing.

Caught on surveillance video, Rhonda Ward-Goodwin is seen forced into her car by an unknown man and driven away. With little evidence, detectives do not have much to go on, until Rhonda's car is found engulfed in flames a week later.

Paramedics respond to a horrific crime scene - a woman is found tied to a bed with slashes across her body. Next to her on the floor, a man with three gunshot wounds. Detectives spend the next several years unraveling this bizarre mystery.

Bobbie Jo Stinnett is found strangled to death in her home. Known to be eight months pregnant, paramedics are shocked to find that Bobbie Jo's fetus has been removed through a crude cesarean section. Investigators race to find the newborn.

After David Castor is found dead from poisoning, his wife and stepdaughter are both suspected of crafting the murder plot. The investigation takes an unexpected twist when one suspect attempts to kill the other.

In 1980, Karin Strom is found strangled to death. A seemingly open and shut case turns into a 26-year 'who done it?' DNA taken from three prime suspects is compared to DNA recovered from the victim. The results are startling.