Experts reveal the gory secrets about cause of death that nature can leave behind on corpses, clues which range from insect infestations to weather conditions.

Experts in criminal profiling trace the technique's history and reveal how it was used in an attempt to identify notorious killers such as Jack the Ripper.

How even the tips of the ears and the soles of the feet may give a criminal away by leaving vital clues at the scene of the crime.

Forensic science has developed a world of techniques for tracking and identifying weapons.

Fire, water, earth - killers call on all the elements in their attempt to cover up their crimes.

Forensic experts describe their use of hi-tech tools to solve crimes, from lie-detectors to computers which can allegedly isolate a guilty face in a crowd.

In fall 1991, a missing six-year-old girl is found raped and murdered in the boiler room of her apartment building.

On Valentine's Day, 2001, socialite Susan Hamilton lay nude, smashed in a pool of blood, in her Oklahoma City mansion.

In March 1988, motorists discovered human body parts dumped on a highway 200 kilometres east of Toronto.

In 1990, Gainesville, Florida was gripped with terror as co-eds were murdered in gory killings.

In September 1996 in Decatur, Illinois, Karyn Slover, a pretty local girl with dreams of becoming a model, went missing.

In February 1996, millionaire Frank Black flew to Florida for a business deal with a mysterious sexy woman and was never seen again.

A series of bombs rocks Fremont, California, targeting, among others, the chief and the ex-chief of police.

Police scramble to find the owner of a private school who vanished from his driveway.

The trail left by a killer leads North Yorkshire police and forensic scientists halfway around the world.

The murder of a gay couple in rural California has police stymied – who would want to hurt the well-like pair? As investigators and forensic scientists dig deeper, they suspect the killings are linked to a series of arsons that have destroyed several synagogues and an abortion clinic. The trail leads them to the sinister world of hate crimes – and a chilling plan that must be stopped.

An investigation into the murder of a Russian prostitute in Los Angeles.

Police investigate four murders committed in one weekend in Barrie, Ont.

A serial killer is on the loose in central Florida and all police have to go on are the bodies of four mutilated, severely decomposed men.

Three women go missing while vacationing in Yosemite National Park.

In April 1992, an elderly couple is found dead in the trunk of their car at their home in upscale Toronto.

The largest police investigation of the decade was mounted to catch a ruthless sniper who terrorized residents of the Washington, D.C. area.

Investigators called to a farmer's field find an unidentified burned corpse and use state-of-the-art forensics to find the murder scene.

The 1996 Summer Olympics in Atlanta, Georgia are rocked by a massive pipe bomb explosion. A woman is killed and hundreds injured. Subsequent bombs at an abortion clinic and a gay bar show a similar M.O., and increasing refinement. Police have no clue who is behind the bombings until they receive a letter signed by 'The Army of God', an anti-abortion, anti-gay, white supremacist group.

A serial rapist stalks and preys on elderly women in a reign of terror that spans nearly two decades.

A sniper who targets abortion doctors turns murderous, throwing a city into panic.

A sniper who targets abortion doctors turns murderous, throwing a city into panic.

Investigators probe the murders of prostitutes in Spokane, where the killer has left the victims with smiling mementos.

A jogger discovers the partially mummified remains of a human body.

A double homicide in Hudson, Wisconsin leaves a small town reeling and two young detectives with little to go on.

In 2001, the Louisiana State University area of Baton Rouge was held hostage by a serial killer.

Profiling arsonist John Leonard Orr.

Las Vegas shows its darker side when the burnt body of a prominent business man is uncovered.

A phantom sect of white supremacists claims responsibility for a series of bombings and bank robberies in Spokane.

Four people are found slaughtered in a factory in Bartow, Florida but the prime suspect has a perfect alibi.

A 22-year-old college student is found raped and strangled with a garrotte on a Buffalo bike path.

The world's top criminal investigators, forensic scientists and behavioural analysts investigate three cases of serial killers.

To solve the murder of a Texas playboy, police dig deep into the heart of Millionaire's Row.

Phoenix police are faced with a unique serial killer team who get their thrills stalking and shooting innocent people at night.

After the brutal murders of two elderly women, police hunt for scanty forensic evidence.

Residents of East Point, Georgia are terrorized by a series of seemingly random shootings.

A task force in Abbotsford, B.C. hunts a deadly stalker who killed one teenage girl and left another barely alive.

Police discover that a teenage girl, found brutally stabbed to death in her car, was involved in a shocking love triangle.