Tuesday

Philadelphia, the birthplace of the United States, played host to millions of tourists and hundreds of gatherings as America celebrated its 200th year of independence. History was made that summer of 1987 -- not because of the bicentennial, but because of the mysterious death of 34 Legionnaires.

On the night of May 22, 1992, Betty Wilson returned home after a meeting. She walked up the stairs to the bedroom and discovered her husband, lying in a pool of blood. Jack Wilson had obviously been murdered... but how? And by whom? Even the experts couldn’t agree.

Between 1985 and 1988, 18 people were choked, molested and left for dead in the remote desert mountains of California. The only witnesses were the insects – and they also proved to play an important role in solving the crimes and bringing the killer to justice.

In the United States, identity theft costs citizens billions of dollars. In some cases, it costs the lives of innocent people.

In the southwest one serial bank robber claimed his loot went to the poor, but this thief was no folk hero. He had a gun and was willing to shoot.

For a price, anything’s possible. Contract killings arose out of the need to establish the perfect alibi. By hiring someone else to do the dirty work, a person can deflect guilt, at least in theory. Forensics is changing that, leading investigators from the killers to their employers.

Florida v. Henry Segura. When Brandi Peters and her three children were found murdered in Tallahassee in 2010, prosecutors pointed the finger at her ex-boyfriend, Henry Segura, who owed her more than $20,000 in child support. But as the trial got underway, an imprisoned drug dealer came forward, saying he had ordered the murders from prison saying Peters had worked as a drug mule and helped herself to more than $90,000 worth of drugs and cash. It sounded like an outlandish claim but DNA evidence found in her bedroom came back as a possible match to a Colombian cocaine trafficker.

Employees busted for breaking the law on the job.

37-year-old Ruben Delgado is found dead by his girlfriend. Her story is suspicious and Ruben is surrounded by pill bottles. Dr. G must work quickly to find what or who killed Ruben. / Pregnant 19-year-old Claudia Alvarez dies in her sleep while at a mental hospital. Dr. G is now tasked with figuring out the mystery of what killed this young girl.

The St. Louis police and the FBI didn’t need bloodhounds, lab tests, fingerprints or other standard tools of criminal investigation to help them track down a serial killer. To put an end to the string of murders, police needed only a computer – and the knowledge of how it worked.

The city of Philadelphia was being plagued by a serial rapist, and then the crimes stopped. They started again -- this time, in Fort Collins, Colorado. Colorado police had fingerprints and a DNA profile, but neither matched those in their databanks. They also had a list of close to 900 names; 83 names had come from Philadelphia police, along with a composite drawing of the rapist. What they didn’t have was a suspect – until they received a tip from woman who recognized the man in drawing.

When a healthy three-year-old boy suddenly developed respiratory and neurological problems, doctors couldn’t explain why. Then his father began to exhibit signs of Alzheimer’s Disease. His mother became ill while traveling in an airplane; fortunately, the passenger seated next to her made his living by removing toxic mold from buildings. When she told him about her family’s health problems, he suspected their home might be making them sick.

The murder of a well respected surgeon in an upscale waterfront apartment community left police in St. Petersburg, Florida baffled. Cell phone mapping, wiretapping and a host of other forensic evidence would uncover a twisted conspiracy, and bring the doctor’s killers to justice.

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

Housewife Elsie Jennes is found dead in the basement of her burning home. Lt Joe Kenda has no leads until Elsie’s son, William, turns up in a police station over 50 miles away, equipped with a suitcase, a pet golden retriever, and a bizarre story to tell.

In Las Vegas, a gang of robbers target an ATM repository and hit the jackpot. Their take was over a million dollars in cash, the largest heist in Las Vegas history.

On valentine's day weekend 1999, three tourists from yosemite national park disappeared and were found murdered a month later. At the time, handyman cary stayner was questioned but released due to lack of evidence. However, when another missing woman was found dead in yosemite park, authorities were able to pin stayner with all four murders.

When the brutalized body of an eight year-old boy is found in the woods outside Gary, Indiana, investigators begin a decades-long search for a sadistic child-killer.