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A burned body is found in a Los Angeles alley, and the victim's ex is the prime suspect, but several years later, new evidence paints a different picture in the Season 3 premiere. (Repeat).

An apparent accidental death of an 87-year-old man is investigated. (Repeat).

The investigation into a mysterious death on a Marine base leads to a violent sexual predator. (Repeat).

The search for a missing college student ends in Minnesota. (Repeat).

An examination of the first time animal DNA was used to solve a criminal case. In 1994 Canada, on Prince Edward Island, the body of Douglas Beamish's estranged wife was discovered. Authorities linked 20 cat hairs found on her jacket to a cat owned by Beamish's parents, with whom he lived. Scientists estimated that chances that the hairs came from another feline were one in 50 million. A jury later

An outbreak of food poisoning in 1984 Oregon leads authorities to a religious cult. (Repeat).

A woman's death is investigated. The husband claims it was suicide; but the police suspect otherwise. (Repeat).

In 1995, Madalyn Murray O'Hair, the founder of American Atheists, disappears along with one of her sons, her granddaughter, and $500,000 in gold coins. The discovery of a mutilated body helps police catch the culprit. (Repeat).

Witnesses claim to have seen a white van run over a man in an alley behind a bar, but when the police respond they find no body and no blood on the van. (Repeat).

Investigators rely on insects and a forensic entomologist to determine when a murder victim was killed. (Repeat).

The investigation into the abduction of an 18-year-old girl is aided when the victim returns hours after the incident occurred. With her help, the police are able to track the assailant to his front door. (Repeat).

The police investigate when a severed leg is discovered in the garbage. Conventional means of identifying the victim are impossible, leading investigators to rely on DNA, anthropology and toxicology to identify the victim and, hopefully, catch the killer. (Repeat).