Some of the world’s most notorious murders are the subject of “It Takes a Killer,” which investigates the crimes from the perspective of the killers, trying to get inside their minds and determine their motives. Leading homicide investigators and experts from such agencies as the FBI and Scotland Yard take a look at the evidence pulled from crime scenes and profile the killer’s behavior to try to piece together the details of each murder, explaining when, why and how each criminal committed the crime. For the wannabe detectives watching the show, the experts also reveal how the crime was solved — which often requires authorities to think like a killer.
When one bodybuilder wants what another bodybuilder has, the end result is a murder-for-hire. The mastermind resurfaces for nearly a decade late, half a world away only to kill a police officer before law enforcement brings him to justice.
A long-haul trucker with a lust for killing crisscrosses the country looking for his next victim. Police don't connect any of this serial murderer's crimes until he slips up and takes out someone from his inner circle.
An evil seductress targets two Georgia police, bleeding them dry, then killing them for their life insurance benefits. She gets away with murder for years before law enforcement untangles her web of seduction and lies.
A state employee wreaks havoc on Southwestern New Mexico, abducting women then keeping them captive in his homemade torture chamber, the toy box. One of his victims finally escapes and brings law enforcement back to his doorstep.
A father vanishes without a trace in central California, setting off a feverish missing person's investigation. Cops discover that he's been murdered, in one of the most heinous ways possible, by the woman he used to trust with his life.
A serial killer hunts young African-American women in Jacksonville, Florida, strangling them and discarding their bodies.
Five people are killed from two separate families in two different states. Police quickly identify the suspect - an ex-con who's recently escaped from a halfway house. The race is on to capture him before he can kill again.
A self-taught serial killer crisscrosses the country at random, murdering victims with tools he calls “kill kits.” Law enforcement is clueless to the madman’s actions until he breaks his own rule and targets a victim close to home.
A homicide investigation ensues after a surgeon's wife goes missing, and remains unsolved after 15 years.
When a banker's soon-to-be ex-wife dies, it is passed off as an accidental fall, but after months of investigation it becomes clear that she was murdered.
A street preacher and his teenage protégé run an Internet scam to rob unsuspecting men, steal their identities, then dump their dead bodies in the woods. The scheme works multiple times until one of the marks escapes.
A criminal terrorizes central Florida, robbing middle aged men, executing them and disposing of their dead bodies. The homicides continue for two years until a bloody handprint leads to the serial killer who happens to be a woman.
A mentally unstable man goes on a two-hour shooting spree, killing one man and wounding two others. Cops have no suspects, until the shooter resurfaces to rob a tanning salon and ends up face-to-face with a iron-willed customer.
A gunman attempts to take out an entire family one by one as they enter their house. It takes law enforcement nearly two years to crack the code behind the murders only to find out they were masterminded by someone too close for comfort.
When a rabbi's wife is savagely murdered inside the family's suburban New Jersey home, it looks like a robbery gone wrong. After years of chasing down leads, police catch a break on a sadistic murder plot.
After three members of an affluent family are mowed down inside their home, law enforcement locks in on a primary person of interest.
When a woman is gunned down in the parking lot of her therapist's office building, it looks like a random act of violence. But security footage and eyewitnesses quickly reveal that the murder is part of a larger scheme.
Law enforcement discovers the man who had been killing prostitutes in upstate New York for two years was living amongst the dead bodies of his victims that were stashed in his home.
The search a local business woman who vanished quickly morphs into a homicide investigation after police discover microscopic evidence inside the woman's home and car. But with no body or eyewitnesses, can law enforcement bring the killer to justice?
A merciless killer terrorizes South Los Angeles during the 1980s then appears to go dormant for 14 years only to resurface in the most hideous way possible. But through technological advances law enforcement is able to bring the madman to justice.
A woman's clairvoyant dream leads cops to the body of a dead woman hidden in the bushes on a pristine beach. As investigators peel back the layers, they soon find out the victim had been marked for death by someone she used to love and trust.
A serial killer crisscrosses California, leaving a trail of dead bodies in random locations. Law enforcement is nowhere near catching the dangerous sociopath, until he shows up at a Sheriff's Department with a victim's body part in his jacket.
A serial predator targets men at gay bars, leaving a trail of dead bodies along the southeastern United States.
The disappearance of a wealthy retiree in South Florida quickly turns from a missing person's case to a full blown homicide investigation focused around an unexpected perpetrator and her convoluted plan to get away with murder.
The murder of a man inside his suburban Los Angeles home sets off a chain reaction of murder, conspiracy and furious cover-ups, which ultimately point back to a mastermind who's in it for the money.
Law enforcement investigates a series of unsolved murders in the state of Colorado over the course of a year, only to realize all the seemingly isolated incidents all point back to a single FBI informant.
Cops investigate the apparent carjacking of a husband and wife in East Los Angeles, California only to discover that the ambush was a ruse, carried out by cousins, to kill the husband for insurance money.
A triple homicide in small town Maine rocks a community and destroys a family. It doesn't take police long to piece together the elements of the crime, and its ruthless cover-up, which point back to a perpetrator close to home.
A disgruntled man snaps and goes on killing spree, terrorizing the entire borough of Brooklyn, New York. Cops track the killer's trail of victims for more than 24 hours before they finally hunt him down across the city.
Four young adults are gunned down inside an affluent home in a suburb of Houston, Texas. Police investigate the quadruple homicide for three years, chasing down hundreds of leads, before arriving at a coldblooded killer with a convoluted motive.