
Forensic Files
A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

The 1996 Seattle murder of suburban couple Raquel Rivera and Jay Johnson is detailed. Evidence from the couple's dog, Chief, eventually ties one of the murderers to the scene. This is one of the first cases where dog DNA was used to convict.

The 1996 Seattle murder of suburban couple Raquel Rivera and Jay Johnson is detailed. Evidence from the couple's dog, Chief, eventually ties one of the murderers to the scene. This is one of the first cases where dog DNA was used to convict.

The 1996 Seattle murder of suburban couple Raquel Rivera and Jay Johnson is detailed. Evidence from the couple's dog, Chief, eventually ties one of the murderers to the scene. This is one of the first cases where dog DNA was used to convict.

A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

A look back at the case of the "River Park Rapist," who assaulted four women in South Bend, Indiana, in 1996. Law enforcement officers arrested Richard Alexander, who was convicted in 1998 and sentenced to 70 years in prison.

Cat hairs found in evidence lead to the first testing of animal DNA to solve a crime.

Cat hairs found in evidence lead to the first testing of animal DNA to solve a crime.

Cat hairs found in evidence lead to the first testing of animal DNA to solve a crime.

The investigation into a brutal attack on two boys near a pond relied on evidence fished out of the murky water. It was the first case where diatom evidence was used to place a suspect at the scene of the crime.

The investigation into a brutal attack on two boys near a pond relied on evidence fished out of the murky water. It was the first case where diatom evidence was used to place a suspect at the scene of the crime.

The story of how scientists solved a 1992 murder case involving cremation. It takes a long time and a fire to cremate a human body and destroy evidence of foul play. But the coroner who performed the autopsy on the body found telltale clues.

The story of how scientists solved a 1992 murder case involving cremation. It takes a long time and a fire to cremate a human body and destroy evidence of foul play. But the coroner who performed the autopsy on the body found telltale clues.

An unusual case involving the 1988 rape and murder of Nancy DePriest.

An unusual case involving the 1988 rape and murder of Nancy DePriest.

An unusual case involving the 1988 rape and murder of Nancy DePriest.

A man claims responsibility for a murder that another man was imprisoned for.

A man claims responsibility for a murder that another man was imprisoned for.