Monday

When the body of a beautiful young woman was found beneath a bridge, investigators wondered if she’d committed suicide. Evidence at the scene proved not only that she’d been carried to the bridge and thrown over the side, but also that she was alive when she fell. Police had to determine who the victim was... and who wanted her dead.

The huge amount of blood at the crime scene spoke of the violence of the attack; investigators describe it as “overkill,” and it’s usually an indication that the victim knew the attacker. Police hoped that, during the struggle, the killer had left some of his own blood – and his DNA -- behind. Their challenge was to find it.

Dna analysis: With the advent of dna analysis, just a few microscopic cells found at a crime scene can be used to put a murder behind bars. Forensic scientists can analyze droplets of blood, hair fiber, or a piece of chewed gum to determine the identity of a victim or killer or to prove innocence.

In 1984, a tragic murder led agents into the frightening world of domestic terrorism. Law enforcement vowed to dismantle the violent faction that claimed responsibility.

In the early 1990’s, a serial killer stalked lone victims in the dead of night, his hunting ground the suburbs of Washington, D.C., his target, anyone who owned a car.

Texas v. Brenda Delgado. Popular pediatric dentist Dr. Kendra Hatcher was happily dating fellow Dallas doctor Ricardo Paniagua when she was brutally murdered in her home in what appeared to be a robbery gone wrong. Police arrested former drug dealer, Kristopher Love, and his girlfriend for the horrific crime which shocked the upscale community. But facing murder charges, the couple revealed a more sinister and stunning murder plot saying they had been hired by Paniagua’s jealous and obsessed ex-girlfriend Brenda Delgado who had been secretly stalking him since their breakup.

Hikers discover trash bags stuffed with human remains in a ravine, raising fears of a serial killer. Investigators turn to tattoos, DNA and cellphone records to identify the victim and reconstruct the events that led to her brutal death.

Over the years, Betty Lou Beets had multiple failed marriages, each of which ended in its own unique way. In 1983, she reported her fifth husband missing and tried to stage a boat accident.

Investigators uncover a bizarre web of lies involving a conman posing as a doctor, Lisa Henning obsessed with reptilian conspiracies—leading to one of New Mexico's strangest and most chilling murder cases.

Bob and Farah are locked in a messy custody battle over their three young children. When one of them ends up dead, the men accused of the murder point the finger at the surviving spouse. But when a judge rules that the gunman's testimony can't be admitted at trial, will the killer escape justice?

In a tiny hamlet just outside the town of Bonnyville, Alberta, Canada, 58-year-old Doreen Bradley, owner and operator of a successful fast food restaurant, is found murdered in her rural home. Authorities are unable to find any clues that point them toward possible suspects. When they uncover a small amount of DNA from an unknown person, investigators must get creative to try to match it to possible killer – and the entire town is shocked and horrified by the results.

When a family of four is brutally murdered, it sends a shockwave of fear through Colorado Springs. Police believe they have a spree killer on their hands, until Lt. Joe Kenda discovers a gruesome connection between the perpetrator and his victims.

In march 1992 claude hawkins was shot dead while he was fishing in coshocton county, ohio. Investigators found no evidence at the crime scene, but hawkins' murder mirrored multiple deaths in other nearby counties and a psychological profile pointed to thomas lee dillon as a suspect. Police arrested dillon on firearms charges, giving authorities time to gather enough evidence to charge him with the murders that had plagued the community.

A Maine father of four is found shot to death after going out for a beer. Is he the victim of a family squabble? Did he run afoul of local crooks? Years later, an unrelated cold case and a guilty conscience help bring the killer to justice.

When police reveal that a slew of murders are the work of a serial killer, a 36-year-old woman believes the killer could be the man who is stalking her.