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The brutal assault of a Maine state trooper is connected to an 8-month-old murder case in New Jersey by the "signature" the alleged killer, Steven Fortin, used in both crimes. (Repeat).

The disappearance of 19-year-old Lori Auker leaves police stumped due to the poor quality of a surveillance tape. With help from NASA, however, digital imaging was employed to clean up the video; later, three hairs that belonged to her cat were found in a suspect's trunk, leading to his arrest and eventual conviction. (Repeat).

The apparent suicide of a Michigan woman, who died from a gunshot wound to the head, is investigated. (Repeat).

A woman searches for the individual who injured her daughter in an accident. (Repeat).

The case of Caleb Fairley is detailed. After a woman and her daughter disappeared, forensic evidence pointed to the 23-year-old. He eventually was convicted of a double homicide and sentenced to life in prison. (Repeat).

The death of Walter Scott, better known as Walter Notheis Jr., lead singer for the 1960s band Bob Kuban and the In-Men, is detailed. He disappeared In 1983. The husband of a woman Scott was involved with was later arrested and convicted of murdering both Scott and his unfaithful wife. (Repeat).

An examination of an unusual case in Texas involving the 1988 rape and murder of a pizza-parlor employee. After a suspect confessed, and he and an alleged accomplice were imprisoned, the case was considered closed. Eight years later, however, another man confessed to the same crime---and DNA evidence cleared the first suspect while implicating that the second was, in fact, guilty. (Repeat).

A look back at a trio of unsolved murders that occurred in Wichita Falls, Texas, during the 1980s details how a fourth murder from the same time period provided the police with more than they realized. John Little, an investigator for the DA's office, picked up the cold cases years later. He soon connected the fourth crime's confessed killer, Faryion Wardrip, to the other murders. (Repeat).

A chronicle of how a single hair helped the police identify where a murder victim pulled from the river had been, and how it helped lead to the killer. (Repeat).

An examination of the Crystal Faye Todd case. In 1991, the 17-year-old was brutally murdered in Horry County, South Carolina. The police asked 52 male acquaintances to provide blood samples so that they could compare the DNA to semen found at the murder scene. The process eliminated all but one young man---and he's now serving a life sentence. (Repeat).

Stories from across the world and refreshing conversations. (New).

Stories from across the world and refreshing conversations. (New).

A 3-year-old child goes missing in Cincinnati. (Repeat).

A woman is stabbed to death on a jogging path and her husband is the first suspect. (Repeat).

Detectives stumble upon the answers to a 35-year-old homicide. (Repeat).

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).