When Montreal teenager Zainab Shafia meets Ammar Wahid, it's love at first sight, but their relationship is forbidden by her strict father who will stop at nothing to ensure his daughter obeys his rules of honor.

A decorated U.S. Marine falls for a married woman; suspicion and jealousy plague their affair, and the stakes are so high, they'll stop at nothing to keep it hidden from their spouses.

Forbidden to date, a teenage girl falls hard for an older man and runs away from home to be with him; before long, young love turns into a fatal obsession.

A teenage boy's traditional parents try to keep him away from his girlfriend by moving him to another country, but the distance only serves to make his heart grow fonder, and he will stop at nothing to be reunited with his girl.

A married man embarks on a forbidden relationship with his 14-year-old babysitter, then his wife finds out, and he will stop at nothing to keep his affair secret from the police.

When lonely teenager Meagan Grunwald meets handsome 26-year-old felon Angel Garcia, it's love at first sight, but their whirlwind romance spirals into a hurricane that leaves a trail of death and devastation in its path.

A female boxer enters a forbidden relationship with her trainer, then she tries to leave his controlling grip and finds herself fighting for her life.

A Christian couple open up their home to a young woman who needs help; however, their act of charity has unexpected consequences when emotional support gives way to physical attraction, and a lustful affair turns deadly.

A young mother falls for a married military man after a chance meeting at his naval base.

A young college student enters into a secret affair with a police officer.

A Texas woman enters into an affair with her daughter's grandfather, causing a major rift in the family and eventually leading to a bloody showdown.

A high-flying attorney embarks on an illicit affair with one of his clients, then the secret affair is revealed, and the laws of attraction prove fatal.

An affair between a married pastor and a member of his flock takes a shocking turn when he proposes a polygamous relationship with his wife; an unexpected arrival threatens their pledge of secrecy.

Teenagers keep their high-school romance a secret from a domineering father with traditional values; when the truth comes out, a heartbreaking choice between love and family brings devastating consequences.

Love and tradition collide when a young woman falls for a handsome stranger; she knows she must keep her relationship hidden from her orthodox father and protective brother.

A Christian woman's faith is tested when she falls in love with a charming new female coworker; as the lovers fight for their love in a community that doesn't want them, the pressure proves to be too much, and the consequences are deadly.

A woman searching for acceptance from her family unexpectedly finds passionate love with her uncle; when their families turn on them, they flee to start a new life in paradise.

A college student's new husband has a dark past that rears its ugly head and ends in a double homicide.

A Filipino woman falls for a married U.S. Navy officer who will do anything to hold onto his mistress and his money.

A young U.S. Army recruit enlists with dreams of serving her country, then she finds love with a commanding officer in her platoon; the two fight to keep their forbidden affair secret while trying to subdue the enemy from within.

In a West Virginia jail, an inmate finds love with a guard, but it comes at a tragic cost.

What really happened, and why? Finding out the facts about any crime may simply depend on whom you ask. In "Shadow of Doubt," Investigation Discovery puts a wrinkle on true-crime storytelling by examining competing theories of complex cases. In these instances, witnesses and suspects point the finger at one another, and every possible account must be considered before the shocking final truth can be discovered.

No matter how complicated or seemingly straightforward a murder investigation may be, experienced law enforcement personnel always employ tried and tested methods to catch their prey. Documenting witness statements, pouring over forensic reports and crime scene photos, nailing down the timeline, and keeping an open mind about the causes and possible perpetrators of a crime are essential to an investigator's success. "Six Degrees of Murder" delves into another essential element that could be the difference between a solved case and a cold one. Featuring stylized re-enactments, each hourlong episode details how investigators untangled a complicated web of relationships before cracking a murder case.

Like a pane of glass cracking in all directions before shattering, the impact of a single crime can create ripple effects that forever alter multiple lives. This Investigation Discovery series unravels actual homicide cases to explore how the past continues to haunt the present for those involved -- loved ones, witnesses, and law enforcement. Each episode is structured around three distinct perspectives of the same crime, and as viewers learn different details by way of first-person interviews and stylized re-enactments, stories, which at first seem random, slowly start to intertwine.

It may be love at first sight that sparks the relationships profiled in this series, but a kiss of death definitely extinguishes them. Actual stories of love gone wrong are told using firsthand accounts that examine how initial feelings of excitement, desire and passion escalate into the most unthinkable acts of crime. Interviews with survivors and family members trace emotional, psychological twists and turns, pieced together with the help of stylized re-enactments, as each hourlong episode ends in a final, shocking, deadly act.

"Who Killed Jane Doe?" presents a unique journey of discovery, loss, mystery and resolution. Featuring Investigation Discovery's distinctive stylized re-enactments, each hourlong episode weaves together two parallel stories: that of detectives who gather clues to identify a victim and the manner of death, and that of a family who knows very well who the victim is and is struggling to find her. The emotional tales honor the nameless and offer a final resting place to a missing loved one.

Inspired by HBO's acclaimed drama "True Detective," Investigation Discovery brings to life actual homicide cases through the words of the law enforcement officers who are still haunted by them. "Real Detective" blends documentary and scripted elements -- and narratives driven exclusively by the detectives themselves -- to create cinematic true crime TV, with featured guest stars including Michael Madsen, Devon Sawa, Curtis Caravaggio and Zoie Palmer. Each hourlong episode ventures deep into the mind of a homicide detective as he or she describes in vivid detail the one case forever ingrained in the memory.

Secrets are never safe from seeing the light of day, even ones that are housed with skeletons and buried six feet under. Those, especially, are of interest to law enforcement personnel, who unearth long-thought gone secrets that eventually help unravel murder mysteries. The details are described in hourlong episodes of "Grave Secrets," with re-enactments providing the meat and potatoes of each true-crime story, and interviews with victims' family, friends, and investigators adding context.

This series delves into the psychological showdown that takes place inside actual police interrogation rooms and dissects what happens to yield a confession. Each hourlong episode takes viewers through the twists and turns of a real homicide case, from the crime scene to the suspects' questioning to the ultimate confession. The police officers and detectives assigned to each case reveal their methodology while interviews with the suspects' and victims' friends and family shed light on the crime. In every case, the interrogating officer will "break" the suspect and get a shocking reveal of what really happened.

From blushing brides turned cold-blooded killers to smitten grooms with shocking dark sides, "Fatal Vows" examines the criminal psychology behind deadly divorces. Guiding viewers through actual stories of love gone wrong are psychotherapist Stacy Kaiser and forensic/clinical psychologist Dr. Brian Russell, who examine each couple to better understand how the marriage turned from flawed to fatal. Stylized re-enactments are supported by interviews with family, friends, law enforcement, and potential victims of the crime, while Kaiser and Dr. Russell provide analysis on unions that break down until divorce and murder collide.