When the bodies of a woman and her son are discovered in a field, insects found on the bodies and a suspicious blonde hair help to track down the killer. S5 Ep3
When a woman is murdered in a Phoenix bar, investigators find foreign hairs and unknown fingerprints, but the most telling piece of evidence is the bite mark on her chest. S8 Ep7
In 1993, Florida was known for attacks on tourists. An injury to a victim - a bite mark - would be a key piece of evidence used to convict an uncooperative suspect. S8 Ep6
A woman is shot to death a day before she was meant to testify against the man accused of robbing her. The robber becomes the prime suspect, but he has a solid alibi. S8 Ep5
A girl admits the testimony that helped convict her uncle of murder was untrue, so his wife tries to find the real killer, hoping her husband can be cleared. S12 Ep19
When a missing woman's body is discovered a month later, witnesses say she was forced into a car. The car had been rented, but the signature didn't match the suspect's. S8 Ep4
When a killer leaves some cigarette butts behind at a murder scene, a ground-breaking DNA test points Napa County police towards an unlikely suspect. S12 Ep15
In 1962, 15-year-old Marlene Miller was murdered. It would take 24 years before forensic scientists discovered microscopic evidence that brought her killer to justice. S8 Ep3
One of forensic history's more bizarre cases sees investigators solve a murder with the help of a squashed tomato and pinpoint reflections in a photo. S12 Ep5
The search for the murderer of Shari Faye Smith, who was forced to write her last will and testament after she was abducted, and send it to her family. S7 Ep42
After a little girl was run over, her mother took the case into her own hands and used her knowledge of murder mysteries to find the vehicle responsible. S6 Ep29
Police suspect a woman of murdering her husband after they find his body on the roadside, but she tells them he went jogging and never came back. S7 Ep39
Investigators turn to satellite surveillance to track down the abductor of a young girl. When they find her, a hidden fingerprint helps solve the case. S6 Ep25
Laura Houghteling left her home to walk to the train station - and was never seen again. A strand of hair found in her hairbrush helped investigators unravel the mystery. S3 Ep35
The discovery of a baby girl's body after an alleged kidnapping led to the revelation that the infant's sister also went missing in very similar circumstances. S3 Ep32
A Californian doctor claims to have proof that the human form of BSE (Bovine Spongiform Encephalopathy) can be contracted through eating infected beef. S3 Ep30
The largest water-borne outbreak of gastrointestinal illness in the US, when bad weather conditions contaminated Lake Michigan with manure from Wisconsin's dairy herds. S2 Ep26
The use of forensic evidence to solve crimes, focusing on the discovery of a woman's charred remains which led police to uncover a tale of drugs, greed and murder. S2 Ep21