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A man calls 911 when he finds blood inside a friend's home: a community activist has been shot dead. Bloody footprints and a credit card trail lead to the killer.

Family, friends and investigators recount the most provocative crimes ever committed by the unlikeliest of pairs: sisters. How and why do they descend into darkness.

Two sisters with little in common cope with their overly protective mother in very different ways and, in the end, with very deadly consequences.

Relatives of 'Suffolk Strangler', Steve Wright, reveal how his shocking crimes impacted the family. Were there any signs of his murderous intentions.

Relatives of serial killer Bobby Joe Long reveal how his shocking crimes impacted the family. Were there any signs of his murderous intentions.

21-year-old Kortne Stouffer vanishes from her bed one night after rowing with neighbours and friends. Investigators pursue various leads, but she cannot be found.

20-year-old Bear Diaz has diabetes, so when he vanishes one night with his belongings, investigators are suspicious. Is it linked to another disappearance.

When thirty-one-year-old Navy veteran Nikki McPhatter is reported missing by her sister, detectives follow a trail that leads them into the dark lair of a killer.

When school-teacher and youth worker Anthony Davis is found killed in his bed police are stumped. However, it turns out that the killer was someone he tried to help.

A wealthy psychiatrist and his son are shot dead. Investigators suspect a robbery until they realise that only a gun and a car are missing.

A 28-year-old man breaks up with his lover and disappears soon after. As the police search for him, a paper trail of suspicious text messages come to light.

Prison Valley is rocked by the murder of prisons chief Tom Clements. But how is it connected to the death of pizza delivery man, Nathan Leon, two days before.

When Jim Durgan's body is found in Prison Valley, his estranged wife and his girlfriend can't explain it. Further investigation unravels a staged murder plot.

A retirement community in Evansville is stunned when a 65-year-old man is found shot dead in his own home. Detectives quickly learn this is no ordinary homicide.

Murder At Sea. A couple's dream retirement in Thailand became a nightmare when pirates boarded their yacht. What followed was a terrifying hostage ordeal, and murder.

High school student Brandon Wentzell falls for Clarissa Chistiakov online. But the course of virtual love doesn't run smooth as the past collides with a toxic present.

A couple and their young daughter are murdered at home, so police ask the surviving child for clues. Evidence takes them into Philadelphia's criminal underworld.

A lecturer finds his wife murdered at home and evidence points to a robbery gone wrong. But, the investigation uncovers it may be more sinister than that.

A wealthy psychiatrist and his son are shot dead. Investigators suspect a robbery until they realise that only a gun and a car are missing.

A 28-year-old man breaks up with his lover and disappears soon after. As the police search for him, a paper trail of suspicious text messages come to light.

Prison Valley is rocked by the murder of prisons chief Tom Clements. But how is it connected to the death of pizza delivery man, Nathan Leon, two days before.

When Jim Durgan's body is found in Prison Valley, his estranged wife and his girlfriend can't explain it. Further investigation unravels a staged murder plot.

A wealthy psychiatrist and his son are shot dead. Investigators suspect a robbery until they realise that only a gun and a car are missing.

A 28-year-old man breaks up with his lover and disappears soon after. As the police search for him, a paper trail of suspicious text messages come to light.

21-year-old Kortne Stouffer vanishes from her bed one night after rowing with neighbours and friends. Investigators pursue various leads, but she cannot be found.

20-year-old Bear Diaz has diabetes, so when he vanishes one night with his belongings, investigators are suspicious. Is it linked to another disappearance.

When thirty-one-year-old Navy veteran Nikki McPhatter is reported missing by her sister, detectives follow a trail that leads them into the dark lair of a killer.

When school-teacher and youth worker Anthony Davis is found killed in his bed police are stumped. However, it turns out that the killer was someone he tried to help.

Trailer owners, Jason and Stephanie McClurg, suffer a series of misfortunes which put their marriage under huge strain. But nobody expected it to lead to murder.

A couple appear to have the perfect romance. After meeting online, blending their families and spending many happy years together, suddenly they're torn apart.

A mother's worst nightmare becomes reality when her son goes missing. The search comes up empty until a motorist makes a horrific discovery.

A husband returns home to find his wife viciously murdered just steps away from their baby daughter. The clues point to someone she knows, so everyone is a suspect.

A Body, A Trough And 800 Pounds Of Concrete. Tracy Fortson was the first female deputy sheriff of Oglethorpe County, but was convicted of her boyfriend's murder. Was she framed.

When Kathy Middleton died of a gunshot in her own home, police suspected her husband, Ken, killed her. His family insists he was wrongfully convicted.

When Police Investigator Jim Horton interviews Gary Evans, he makes an unlikely friend of the infamous burglar. But is their bond built on trust or treachery.

When a missing person report spirals into a murder case, Detective Kent Schoonover must first crack a complex case of stolen identity to solve the investigation.

Police officer Andy Kimbrel hopes to find happiness with new wife Stephanie Keller. When the marriage starts to fail, Andy falls victim to manipulation and violence.

Playboy twins Sandy and Mandy Bentley soar to fame in the 1990s. Until an affair with a Vegas 'High Roller' leads to a brutal double murder in the Hollywood hills.

Investigators deal with puzzling clues and odd witness accounts when trying to solve a 1987 murder. Will lost evidence be the key to identifying the killer.

Levi Bellfield denied his connection to a series of murders and rapes, but videotaped police interviews tell a different story. Experts spot the giveaway signs.

In a rage, Ben Butler killed his young daughter, Ellie, but along with his wife faked a 999 call and protested innocence. Experts analyse their interviews.

A Body, A Trough And 800 Pounds Of Concrete. Tracy Fortson was the first female deputy sheriff of Oglethorpe County, but was convicted of her boyfriend's murder. Was she framed.

When Kathy Middleton died of a gunshot in her own home, police suspected her husband, Ken, killed her. His family insists he was wrongfully convicted.

When Police Investigator Jim Horton interviews Gary Evans, he makes an unlikely friend of the infamous burglar. But is their bond built on trust or treachery.

When a missing person report spirals into a murder case, Detective Kent Schoonover must first crack a complex case of stolen identity to solve the investigation.

Michelle Lira dreams of being a doctor, until one day a rollercoaster romance steers her life in a different direction, straight into a deadly ambush.

The disappearance of Dena Raley-McCluskey was lost in the media frenzy over higher profile killings, until a bored cop stumbled upon her years-old case.

When a lifelong Long Islander, Donna Bocklet, announces she's moving to Florida, it sends a shock wave through her friends and family that ends in her murder.

When a single father is found murdered, the autopsy reveals discrepancies. Investigators must decode digital clues to reveal a complex plan by a twisted killer.

A man calls 911 when he finds blood inside a friend's home: a community activist has been shot dead. Bloody footprints and a credit card trail lead to the killer.

Dear Katherine, It's Me The Killer. When 18-year-old Katherine Foster goes missing, terror strikes the heart of the University of South Alabama. Is there a killer in their midst.

When Michael Severance goes AWOL the community of San Angelo rallies around his new bride. But is there something more sinister behind his disappearance.

17-year old Shafelia's disappearance was a mystery - until her sister is arrested for a robbery. Carol Wardell vanished and her husband left tied-up.

Bestselling author, Helen Bailey, was a wealthy widow. After finding love again with Ian Stewart she vanished. He helps in the search - but was it a cover-up.

When student Amanda Anderson's body is found by her younger brother, detectives turn to her friends and family. Then, a microscopic discovery solves the case.

In 2002, a bartender is found beaten and stabbed to death near his home. Rookie detective, Pam Dunklin, unravels a morbid conspiracy of love, greed and murder.

Family, friends and investigators recount the most provocative crimes ever committed by the unlikeliest of pairs: sisters. How and why do they descend into darkness.

Two sisters with little in common cope with their overly protective mother in very different ways and, in the end, with very deadly consequences.

When 20-year-old Chloe Randolph gives birth to a baby boy, her family is over the moon, but what should be a blissful time turns into a waking nightmare.

I Always Knew I Could Kill. Patrick Pidock's daughter lived in constant fear of her father's sudden, violent outbursts. But no one could know what he was truly capable of.

Detectives investigate the murder of Harlem Globetrotters trainer Tom Bashline. As the investigation deepens, secrets emerge about the local celebrity.

The Bride Who Will Never Be. When Melanie marries James Addie, she believes she's found the perfect husband, unaware he leads a double life that one day will end with death.

After sneaking out to a party, 19-year-old Jose Najera returns home to find his parents dead in their bedroom. Is it a random killing or a botched robbery.

Single mum Rainey Morin thinks she's found her soulmate in Robert Kowalski. But beneath his bright veneer is a dark history threatening to wreak havoc.

The discovery of a body rolled up in a rug at an architect's apartment sparks a hunt for the serial killer who murdered fashion designer Gianni Versace.

The investigation into 26-year-old Kim Medlin's mysterious disappearance reveals secrets that shatter the safety of everyone in the town of Monroe, North Carolina.

Michelle Lira dreams of being a doctor, until one day a rollercoaster romance steers her life in a different direction, straight into a deadly ambush.

When's Mom Coming Home? After her divorce Joann Albanese meets a new man. But by the time Joann discovers her boyfriend isn't who he claims to be, it's already too late.

When Police Investigator Jim Horton interviews Gary Evans, he makes an unlikely friend of the infamous burglar. But is their bond built on trust or treachery.

A Body, A Trough And 800 Pounds Of Concrete. Tracy Fortson was the first female deputy sheriff of Oglethorpe County, but was convicted of her boyfriend's murder. Was she framed.

When Kathy Middleton died of a gunshot in her own home, police suspected her husband, Ken, killed her. His family insists he was wrongfully convicted.

A wealthy psychiatrist and his son are shot dead. Investigators suspect a robbery until they realise that only a gun and a car are missing.

A 28-year-old man breaks up with his lover and disappears soon after. As the police search for him, a paper trail of suspicious text messages come to light.

In 1993, 16-year-old Daniel Villegas confessed to murder. But, was he was forced to confess to a shooting he knew nothing about.

When thirty-one-year-old Navy veteran Nikki McPhatter is reported missing by her sister, detectives follow a trail that leads them into the dark lair of a killer.

When school-teacher and youth worker Anthony Davis is found killed in his bed police are stumped. However, it turns out that the killer was someone he tried to help.

A mother's worst nightmare becomes reality when her son goes missing. The search comes up empty until a motorist makes a horrific discovery.

A husband returns home to find his wife viciously murdered just steps away from their baby daughter. The clues point to someone she knows, so everyone is a suspect.

When a mother is found dead and covered in paint in the basement of her home, investigators must work tirelessly for 18 months to find the person responsible.

When 18-year-old Heidi Allen vanishes from her convenience store job, two brothers are arrested for kidnapping. But years later, a chilling new story emerges.

The death of a young woman leads police to New York's disco and gay club scene. Was her murder a hate crime or were there more mysterious motives at play.

Fishermen find a 27-year-old man shot to death on a river embankment. A jailhouse call leads investigators to a twisted love triangle that ended in murder.

A man takes control of an 18-wheeler semi-truck while holding his wife at knifepoint. US Marshals arrest a suspect wanted for the murder of his girlfriend.

Playboy twins Sandy and Mandy Bentley soar to fame in the 1990s. Until an affair with a Vegas 'High Roller' leads to a brutal double murder in the Hollywood hills.