Monday

When messages for two wealthy sun-seekers start piling up at their luxury Acapulco hotel, police scout the area – but the breakthrough clue comes from a letter sent back home.

A German woman and her boyfriend vacation in Miami Beach, Florida. But a late night drive through a sketchy part of town leads to murder – and the mystery of who pulled the trigger.

Explosives investigations: The crime lab is the place where science meets murder. In new york state, eleanor fowler opened a small package, which as mailed to her home. When she lifted the lid the box exploded killing her instantly. Within minutes, five other bombs exploded proving to be as fatal as the first. The investigation into this serial bombing case became one of the most massive investigations in history.

Fingerprinting: The identification division of the fbi relies on fingerprints as one of the most effective ways to identify criminals. Fingerprints, along with palmprints and footprints are an indisputable, time-tested method to establish someone's id beyond a shadow of a doubt. Computerization has all but eliminated the old inkpad, and print identification that used to take months now takes minutes.

A holiday homecoming turned into horror when a Tennessee couple was brutally slain in their own house. Their meticulously planned retirement was shattered by a chilling betrayal, leaving behind a crime scene so gruesome it stunned even seasoned investigators.

One by one, prostitutes in spokane, washington are being hunted down and discarded in remote wooded areas by a vicious serial killer. On each victim’s head, police find his macabre calling card – a plastic bag emblazoned with an ironic smiley face. Investigators soon realize they are dealing with the worst type of serial killer – an average joe with no criminal background and with the extraordinary ability to blend in with the community. With few clues to work with – and as the death toll continues to rise – investigators turn to ballistics experts, space age fingerprinting technology, and to a forensic botanist who believes he can solve the crime by reading plants and trees.

Employees busted for breaking the law on the job.

When Erin Chorney disappears with a trace suspicion falls on the last person to have seen her, her ex-boyfriend Michael Bridges. After investigator searches come up empty handed, they orchestrate an elaborate Mr. Big sting operation to woo Bridges into

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.

Handwriting analysis: We’ve all heard that our handwriting tells more about our personalities than we think. Are we risk-takers, have low-esteem, fun loving, or are we capable of murder? While our handwriting may not reveal the nuances of our personalities, the dotting of the "i's and crossing of the "t"s is an important business in criminal investigation. Apparent suicide notes, letters from suspected offenders and signatures are scrutinized down to the last dot. Handwriting comparisons can tell if the victim really did sign that new life insurance policy, or if the person who had everything to live for actually wrote the eloquent suicide note.

In the 1980s, the United States faced a deadly new enemy abroad, an expanding network of terrorists targeting American interests. Hundreds of innocent people were killed in bombings, executions, and hijackings.

James and Doug are locked in a legal battle in Washington State over an oil deal gone wrong, both hoping to buy the other out. When one of them ends up dead, a surprising link is discovered to the seemingly unrelated disappearance of a North Dakota man.

A family vacation turns tragic when a beloved grandfather suddenly collapses. And things get complicated when his family objects to an autopsy. And then, a seemingly healthy woman dies without warning. Now it’s up to Dr. G to put the pieces of a very unusual puzzle together.

Florida v. James Colley Jr.. In Florida in 2015, Amanda Colley was starting her life over after a contentious divorce and an ongoing custody battle with her ex-husband, James. The 36-year-old mother of two was excited about a new love interest, Lamar Douberly. Then, one summer night, she returned to a ransacked house. Lamar and two girlfriends arrived to join her as police were called. Then, gunshots rang out; glass shattered. After more shots, Amanda and her friend Lindy, a mother of three, were both dead and Rachel was injured. The gunman took off. James Colley was arrested 600 miles away and brought back to Florida to stand trial for double murder, with both Lamar and Rachel giving dramatic firsthand testimony.

Weapons are the hallmark of violent crime, tools designed to harm – or kill. Forensic science has developed a world of techniques for tracking and identifying these devices. Blood spatter, explosive residue, ballistics and trauma wounds tell crime scene investigators their deadly story

While her 10-year-old daughter listens upstairs, failed self-help guru Derek Medina shoots his wife during an argument, then casually posts pictures of her dead body on Facebook.

After a night of drinking, 45-year-old Ana Trujillo bludgeons her on-again-off-again lover Stefan Andersson to death with a blue suede stiletto shoe.

University student Samantha Josephson climbs into what she believes is her rideshare home after a night out with friends. Instead, she is abducted and murdered. Investigators race to identify her killer, while her tragic death sparks a nationwide campaign to improve rideshare safety.

The Klaus family is getting ready for Christmas in the small town of Castor, Alberta. A fire engulfs their home in the middle the night while everyone is asleep, and the investigators suspect that it isn’t an accident. The whole case changes when the son starts seeing the spirits of his dead family.

Florida v. James Colley Jr.. In Florida in 2015, Amanda Colley was starting her life over after a contentious divorce and an ongoing custody battle with her ex-husband, James. The 36-year-old mother of two was excited about a new love interest, Lamar Douberly. Then, one summer night, she returned to a ransacked house. Lamar and two girlfriends arrived to join her as police were called. Then, gunshots rang out; glass shattered. After more shots, Amanda and her friend Lindy, a mother of three, were both dead and Rachel was injured. The gunman took off. James Colley was arrested 600 miles away and brought back to Florida to stand trial for double murder, with both Lamar and Rachel giving dramatic firsthand testimony.

One of the most intensive manhunts in the history of Texas took place over the summer of 1999 when brutal serial killer Angel Resendez Ramirez was on the loose. Riding the rails eastward and driving the vehicles of his victims back west, Resendez terrorized railroad communities all across America before finally surrendering to police.

In 1989, residents of a close-knit apartment community in Virginia gathered for a holiday celebration. For Tammy Brannen and five-year-old daughter Melissa, Christmas was always a special time. Then…without warning, the little girl was gone.

Jennifer gets a visit from a member of her church congregation as Bill wants to visit her, but the visit soon turns to fear as he wants to take her.

When two residents of a small town nestled between Maine and the Canadian border are found brutally murdered, fear completely overwhelms the town of 70.

Social media star Ali Abulaban’s perfect image crumbles when jealousy over his estranged wife leads to a brutal double murder, captured in digital evidence and chilling courtroom drama.