A serial bomber was on the loose in Illinois. Two churches had been bombed and one person was killed. Investigators had to capture the criminal before he struck again and they hoped to catch him by following a thin copper wire.

In 1987, Susie Mowbray was charged for her husband Bill Mowbray's death, which had the appearance of suicide. Her son was so convinced of her innocence that he enrolled in law school to try and clear her name.

In Pennsylvania 1984, a passer-by finds the torso of a woman in a cardboard box. Investigators rely on insect activity analysis by a forensic entomologist to determine when the murder victim was killed. She remained unknown until a year later, when her sister called to report her missing. Eventually she was identified and a man was convicted of her murder, but would further forensic entomology change the outcome?

The investigation into a suspicious death hits a dead end when the autopsy indicates that no foul play was involved. But a telephone tip and the sensitive nose of a forensic examiner indicate otherwise. [also marked as S7:E38]

Georgia resident Sheila Bryan, who was convicted of killing her mother in a car fire, is granted a new trial. An expert fire witness shares an opinion on how the fire ignited which differs from the prosecution's theory and, if verified, would clear Bryan of any culpability. [also marked as S7:E50]

When a hit-and-run accident claimed the life of a high school athlete, everyone in town mourned his passing. Finding the killer was a long shot at best, but investigators hoped tiny paint chips and pieces of plastic found at the scene would lead them to the person who was behind the wheel.

Troubling clusters of deadly cancer cases strike concerned communities across the country. In a Phoenix suburb, too many children are fatally stricken with leukemia and, on a Connecticut street, there is a disproportionate amount of illness, including four cases of brain cancer. Modern environmental agents such as buried poisons and electrical substations are found... Could these be the culprits?

A woman is found dead from a gunshot wound and police suspect her husband; however, forensic teams prove what really happened and the truth is stranger than fiction. [also marked as S7:E17]

How Illinois scientists solved a 1992 murder case involving cremation. It takes a long time and a very hot fire to cremate a human body, and thus destroy all evidence of foul play, but the coroner who performed the autopsy on the badly burned body of Charles "Jack" Lynch found telltale clues. Not only had the victim been burned, he’d also been stabbed -- 24 times, with two different knives. Police knew that a person, acting alone, would probably use only one weapon. So investigators were on the lookout for a couple of killers.

Forensic scientists work with the only clue recovered from a multiple-victim shooting: a 12-gauge shotgun. Scientists use unique methods to lift the serial number from the weapon in order to trace it to its owner. [also marked as S7:E40]

A union official is executed in his home not long after a strike by the union membership. Neither his wife nor anyone in the neighborhood heard any gunshots. It would take a forensic sound test, an electron microscope, and a nightgown to explain why.

Two men were murdered, while sleeping in their bed. One night later, an arson fire destroyed a family planning clinic. Investigators wondered, wherether some shards of glass, paintchips and a chicken feather, could link for what appeared to be, two separate crimes.

A suspicious fire swept through an apartment killing two young women. The cause of the fire and the identity of the victims were unclear. But a closer look at the fire scene revealed something hidden in the ashes.

It was supposed to be a routine motorcade for the Queen of England. But on the way to Yosemite National Park, a car carrying three Secret Service agents collided with a car driven by a deputy from the local sheriff's office.

A fire erupted in Kings Cross Station in London, killing 31 people and injuring dozens more. Investigators pinpointed the cause of the fire, but it took state-of-the-art technology and fluid dynamics experts to explain why it became a deadly inferno.

A young woman was found dead on a golf course in the Bahamas. The grass on that course was so distinctive, it had evidentiary value. The evidence led police to two suspects. Each blamed the other, and they had to find out who the killer was.

Now it's not only a fingerprint which can link a killer to a crime; a shoe print can be just as telling. Armed with little else, police hoped the shoe impressions found at a Lansing, MI crime scene would put their investigation of Audrey Nichols' murder back on track.

The woman could have lost control of her SUV on the icy road, and plunged down an embankment into a shallow creek. But there were footprints in the snow leading away.

A successful stockbroker told his wife he'd be working late, and when he didn't come home, she reported him missing. Investigators found his car a few blocks from his office and, two days later, proof that he had been murdered.

When a hit-and-run boating accident caused the death of a popular young man, investigators faced the daunting task of searching for one boat among 1200 others. They asked anyone who had seen the accident to come forward. The man who responded did much more than witness the crash; he was a passenger in that other boat.

Caren Campano disappeared and her husband, Chris became the prime suspect -- especially after police found a huge bloodstain on the Campano's bedroom carpet. When they sprayed the bedroom with Luminol, they discovered it was awash with blood spatter. Complex DNA testing - 'reverse paternity' tests - proved it was Caren's blood. Now all they had to do was find her body.

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, Eye doctor Jack Wilson, beaten and stabbed to death, lying in a pool of blood with a baseball bat nearby. Jack Wilson had obviously been murdered... but how? And by whom? Even the experts couldn’t agree.

In 1996, when a fundamentalist group is accused of robbing banks in the Spokane, WA area, authorities know immediately they are dealing with experienced criminals. A tip leads them to the alleged perpetrators and the evidence found at their homes is extensive. But in court, this wealth of evidence must withstand a well-funded defense.

In 1991, San Francisco pornographer Artie Mitchell was murdered in his home. His brother and business partner Jim is found near the scene carrying a rifle and, later, confesses to shooting Artie. The question for investigators is whether the shooting was pre-meditated. A 911 call in which the fatal shots can be heard, and a computer reconstruction of the crime scene, provide the answer.

The investigation of a murder case in New Jersey is stalled until a strikingly similar attack occurs in 1995, to off-duty Maine State Trooper Vicky Gardner during a routine stop.