Investigation Discovery HD (Pacific)

The only thing scarier than a serial killer is one hiding in plain sight.

When being interviewed by police, psychopaths often use manipulation to thwart the investigation; experts explore the anatomy of the key manipulative tactics of psychopaths and how they try to utilize them for their own sinister gain.

An early morning fire inside an apartment complex soon reveals something worse, the dead bodies of a young woman and an infant boy; detectives find a psychopath who appears polite and gentle, then later as a pawn of imagined demons.

Police catch a break on three cold case murders when emerging DNA technology makes a stunning match, a 73-year-old man who's been in prison since 1993; detectives interrogate the frail man whose harmless façade is hiding a murderous psychopath.

When a young mother goes missing, her husband joins the search; police discover her dismembered body in a stack of bins; detectives find her husband to be a typical suburban dad, but learn a murderous psychopath lurks within.

Terror rocks an Ohio town when a mother, her two kids and a close friend vanish; investigators track down the prime suspect and uncover a house of horrors; detectives find themselves dealing with a psychopath with a bizarre obsession.

A vehicle plows down a 75-year-old military veteran on a country road in an apparent hit-and-run; when a young man confesses to the crime, detectives quickly learn they've encountered a psychopath with an intense desire to thrill kill.

After the shooting deaths of father, mother, and two adolescent boys in their suburban Baltimore home, investigators realize it's not a robbery gone wrong but rather the execution of a loving family, done by a callous psychopathic killer.

William Cosden Jr. coerced his much younger sisters, Karen and Susan, into keeping secrets about what he did; now the girls are adults, and with one facing death, they reunite to try to repair the trauma keeping those secrets caused them.

Not every mother and father raise the child of their dreams, as some children grow up to become killers; through heart-stopping stories, parents must come face to face with the horrible truth that the child they loved and trusted is a monster.

In 1965, Rodney Alcala attacks a teenage girl - only to brutalize and rape her again three years later; she feels guilty when she discovers he assaulted another girl soon after - but they are merely two of this man's countless victims.

Not every mother and father raise the child of their dreams, as some children grow up to become killers; through heart-stopping stories, parents must come face to face with the horrible truth that the child they loved and trusted is a monster.

In 1965, Rodney Alcala attacks a teenage girl - only to brutalize and rape her again three years later; she feels guilty when she discovers he assaulted another girl soon after - but they are merely two of this man's countless victims.

William Cosden Jr. coerced his much younger sisters, Karen and Susan, into keeping secrets about what he did; now the girls are adults, and with one facing death, they reunite to try to repair the trauma keeping those secrets caused them.

A New Hampshire town reels after police arrest four teenagers for robbing and murdering a 42-year-old mother and maiming her 11-year-old daughter; detectives uncover two suspects with the characteristics of sadistic psychopaths.

Behind a church lies a dismembered body burned beyond recognition; investigators identify the victim and receive a tip the suspect is female; a police interview reveals her as the most remorseless psychopathic killer they've ever seen.

A man calls 911 with his dying breath, and first responders arrive to find him brutally murdered and stabbed 59 times; when detectives question his best friend, they uncover a tangled story of deception and jealousy that ends in psychopathic rage.

A killer shoots a young woman dead in her boyfriend's Orlando, Fla., apartment; hours later, he turns up in a hospital bed 500 miles away with a gunshot wound and a bizarre story that unravels to reveal he's a lying, callous psychopath.

After Kate Johnson is murdered in her dormitory room, detectives ask why this innocent young woman was targeted; detectives collect 400 DNA samples, establish a secret task force and track down Johnson's killer to get their chilling answer.

On Christmas day, detectives are called to a crime scene where they find a young woman bound, gagged and mutilated in a horrific manner; then the killer turns his sights on Homicide Detective Molly Daul.

Caught up in a love triangle, young chef Heather Mallory vanishes; detectives and Heather's parents search for the truth in an investigation involving wiretaps, confidential informants and a dramatic resolution deep in the forest.

When Ashley Benson is found murdered in a trendy Portland, Ore., hotel, detectives quickly dial in on three suspects, all of whom have been romantically linked to Benson whose parents must come to grips with their daughter's secret life.

Film director Adrienne Shelly is discovered hanging by a bedsheet from the shower rod in her bathroom; while Shelly's death looks like a suicide, her husband insists it was murder, and detectives start to believe him.

When Robert Schwartz, a father of three, dies in a brutal murder in his own home made to look like a ritualistic killing, the investigation uncovers a killer much closer to home.

After New York City fashion photographer Joel Schoenfeld is shot dead in his Greenwich Village studio, detectives uncover a dark secret and a twisted tale of revenge.

Randy Sheffield's family finds him dead in his bed and assumes he has succumbed to a heart attack, but detectives slowly uncover a murder conspiracy that will rock Sheffield's small town for years to come.

Locals stay quiet to protect their own when a new resident of Hartford, Ky., is found tied up and floating in a toolbox in a creek.

Secrets emerge in a quiet neighborhood when young mother Stacey Shoemaker is shot dead; the once tight-knit cul-de-sac in Wagoner, Okla., is now full of suspicions, finger-pointing and fear.

The community of Kankakee, Ill., comes together to aid police in uncovering the vile killer in the shooting death of an up-and-coming model, Sarah Washington.

Family and friends are concerned when Phillip Brewer and Jody Fortuna go missing from Gillette, Wyo.; eventually, the horrifying truth comes to light.

A woman working for a plant in Camden, Ark., goes missing; when a local stumbles upon Ruiz Stone's abandoned van, her family fears the worst, and some speculate Ruiz fled town with a lover, but detectives reveal something far more sinister.

Tourist town Traverse City, Mich., is turned upside down when 18-year-old Kalee Bruce is bludgeoned to death at her workplace.

In the Miami suburbs, a hard-working mother from Trinidad vanishes into thin air; detectives Danny Smith and Jonathan Zeller soon uncover her secrets but then are stalled until they come up with a highly unusual way to smoke out the perpetrator.

This true-crime series hosted by Lt. Joe Kenda, one of America's toughest detectives, features incredibly disturbing and mind-blowing cases from across the country. Lt. Kenda expertly guides us through the complex twists and turns of these bizarre crimes.

Veteran journalist Paula Zahn unravels criminal investigations by featuring the opinions of law enforcement officials, the families of the victims and the incarcerated, lawyers from both sides and first-time TV interviews with convicted murderers.

Amanda Blackburn and her unborn child are killed during a home invasion; with no forced entry and few leads, investigators have to piece together scattered clues, surveillance footage, stolen items and witness accounts.

This true-crime series hosted by Lt. Joe Kenda, one of America's toughest detectives, features incredibly disturbing and mind-blowing cases from across the country. Lt. Kenda expertly guides us through the complex twists and turns of these bizarre crimes.

Veteran journalist Paula Zahn unravels criminal investigations by featuring the opinions of law enforcement officials, the families of the victims and the incarcerated, lawyers from both sides and first-time TV interviews with convicted murderers.

Amanda Blackburn and her unborn child are killed during a home invasion; with no forced entry and few leads, investigators have to piece together scattered clues, surveillance footage, stolen items and witness accounts.

In the Miami suburbs, a hard-working mother from Trinidad vanishes into thin air; detectives Danny Smith and Jonathan Zeller soon uncover her secrets but then are stalled until they come up with a highly unusual way to smoke out the perpetrator.

In Aurora, Ind., the townspeople are horrified when beloved mother and hairstylist Leigh Jennings is killed in her own home.

In Payette, Idaho, teacher Elizabeth Baune is the pillar of her community until she is stabbed to death in her own home; townspeople suspect Baune's kindness may have been behind her death.

Christmas is ruined when hikers in New Mexico stumble across Roxanne Houston's shallow grave; the murder rocks the community of Taos and tension builds between those with small town values and the outsider lifestyle on the Mesa.

Two 18-year-old girls fall head over heels for each other, but when a 49-year-old man decides to come between them, bullets start to fly.

A married father of two engages in an affair with his wife's first cousin - a love triangle that will lead to one very murderous twist.

A man becomes fixated on his co-worker, believing they should be married, but she's already married to her jealous husband.

Police find three people killed execution-style in the cooler of a Louisiana convenience store; a man gives a series of conflicting confessions leaving everyone to wonder what really happened.

Three people are killed execution-style in a Louisiana convenience store.

Young Teresa McAbee goes missing near her home in Mascotte, Fla.; when her body is found the next morning, James Duckett, is the only police officer on duty.

Young Teresa McAbee goes missing near her home in Mascotte, Fla.; when her body is found the next morning, James Duckett, is the only police officer on duty.

Pulling back the curtain on bizarre double lives and stories of men and women who thought they were happily married, until the day they uncovered a shocking secret about their spouse.

When a colonel's wife discovers her husband's startling double life, she must choose between her own future and the good of the U.S. military; she overcomes betrayal to launch a one-woman campaign to protect other military spouses.

Debra Proctor, a nurse and a pillar of her Cherokee community, meets a caring stranger online and falls in love; they have a happy marriage until the disturbing truth about him causes her world to come crashing down.

TV news anchorwoman Marisa Burke and her seemingly perfect husband Mark Kandel become the eye of a media storm when Mark's twisted double life starts making headlines.

Single mom, Wilda Gadd, finds a family-oriented single dad who seems like the perfect life partner, until he devolves into a dangerous monster; she's the only one who can bring him to justice.

Carol Dennis' decades of hell started when a polygamous Mormon cult leader selected her, at the age of 16, as his next wife.

One family's American dream goes up in flames; as they try to rebuild what's left, they vow to search for justice.

Scams, lies and sex tapes have tarnished the reputation of the '90s high school sitcom; friends, parents and actors divulge the harsh realities some cast members faced when the cameras stopped rolling.

Sex therapist Amie Hardwick had the beauty and brains to charm Hollywood, as well as a number of celebrity boyfriends; when one star rises, another's obsession is never far behind.

Scams, lies and sex tapes have tarnished the reputation of the '90s high school sitcom; friends, parents and actors divulge the harsh realities some cast members faced when the cameras stopped rolling.

Sex therapist Amie Hardwick had the beauty and brains to charm Hollywood, as well as a number of celebrity boyfriends; when one star rises, another's obsession is never far behind.

One family's American dream goes up in flames; as they try to rebuild what's left, they vow to search for justice.

Ramon Sosa, a former boxer, marries Lulu, a beautiful brunette, and finds himself in the fight of his life; Ramon is forced into drastic action when he receives a warning that his wife is hiring a hit man.

Law student Jessika Rovell becomes engaged to a Philadelphia doctor who claims to be a Naval intelligence agent; when his secret life finally comes to light, she discovers he is one of the worst sexual predators in Pennsylvania history.

After 53-year-old Barbara Hefner disappears from her Georgia residence, her body is found floating in nearby Folly Lake; during the investigation, police officers uncover a a recent inheritance and a secret affair.

A judge discovers the body of 22-year-old Misty Morse, bound and floating in the marshy waters of Florida's Indian River.

Fifteen-year-old Linda Strait fails to return home after a trip to the store, then her body is found near the Spokane River, and detectives will spend the rest of their careers searching for Strait's killer.

The body of 39-year-old Beverly Jackson is found in a car pulled from a Florida canal; the police explore the single mother's routine and relationships, but it will take the help of a hotline tipster to track down her killer.

Twenty-six-year-old Florence Ballino is found murdered; her attacker deliberately leaves behind clues in an attempt to confuse investigators, but Detective Postiglione identifies one clue that inextricably connects to the killer.

After a professor's body is found in the office of a used car dealership, Detective Postiglione solves the puzzle by spotting the killer's window of opportunity.

A crime scene shows evidence of conflicting motives for a double murder, but an unlikely clue on the living room floor helps Detective Postiglione zero in on what really happened, leading to the arrest of an unassuming killer.

When the remains of a young mother are discovered in a remote area outside Nashville, Tenn., Detective Postiglione solves the crime by recalling a detail from the wooded scene and puts a dangerous murderer behind bars.

After a frantic welfare call, police find 79-year-old Avanell Cowgill murdered in her home; with no clues except for a trail of strange credit card transactions, investigators hope surveillance video will give them what they need to reveal a killer.

In March 2014, the bodies of two women lie behind a grocery store in Galveston, Texas; A trail of surveillance footage could possibly reveal who killed two women and why.

Hawaiian getaway turns into a nightmare when 28-year-old Ivanice Harris vanishes into thin air; Detectives trace Ivanice's movements to a Waikiki hotel, covered in surveillance cameras.

Eleven-year-old Carlie Brucia disappears while walking home from a friend's house; police discover security camera footage of her shocking abduction, and the inquiry becomes a manhunt.

In Fontana, Calif., a bizarre traffic accident takes the life of 18-year-old Cristian Dominguez Aguilar; the driver vanishes into thin air, so police turn to surveillance video for answers.

In Farmville, North Carolina, three family members working at a convenience store fall victim to the most cold-blooded crime the town has ever seen; detectives attempt to pick up the killers' video trail and put an end to their bloody spree.

In Ohio, a man shoots his ex; in Utah, police go to a house where a woman and children escape from a suspect armed with a machete; in California, a former patient attacks his therapist.

In Florida, after a high-speed chase, a sheriff's K9 is on the loose on its first pursuit; deputies in an Arkansas jail face a battle when inmates turn violent; in Georgia, officers head into the woods to hunt down a felon.