Prime Suspect: The Madeleine McCann Case

From Executive Producer Dick Wolf, this true crime investigative series follows veteran prosecutor Kelly Siegler, and her rotating team of seasoned detectives, as they travel to small towns across the country and help local law-enforcement agencies dig into unsolved homicide cases that have lingered for years without answers or justice for the victims due to lack of funding and proper forensic technology.

This true crime series shows how innocent people have been convicted with dubious forensic techniques and tools such as touch DNA and cadaver dogs

Crime author and investigator Jax Miller and former police investigator Sarah Cailean tackle a mystery that has stumped authorities for nearly two decades -- the confounding cold case of Lauria Bible and Ashley Freeman, two Oklahoma teenagers who disappeared in December 1999 after the Freeman family trailer was burned to the ground. In the four-part documentary series, the investigators delve into the many strange theories of the case and unravel a much larger story of unsolved murder, allegations of cover-up and corruption, and a truth that proves even more incredible.

Working for nearly three decades with the Charlotte (N.C.) Police Department, Detective Gary McFadden has developed unorthodox methods that have helped him solve more than 700 homicide cases. He has a 90-percent success rate with the investigations he pursues. "I Am Homicide" shows how Detective McFadden uses his street smarts to work the neighborhood networks and gather critical information for leads, at times risking his life by trusting the streets he calls home.

The story of how the lottery invented to finance a zoo was incorporated by Rio de Janeiro's popular culture and, in the hands of organized gangsters, transformed itself into an immense crime empire.

NBC News correspondents Keith Morrison, Josh Mankiewicz, Stephanie Gosk and Andrea Canning examine the final day of a victim’s life – the split-second decisions and pivotal moments that made the difference between life and death. Detectives retrace those crucial hours looking for clues to solve the mystery.

True stories of Finnish criminal acts. Most of the stories have been previously published in the Nordic Police Stories book series.

From chilling betrayals to murder plots, this true-crime docuseries dissects the dark side of love through eyewitness testimonies.

Body cameras capture the life-or-death decisions made by police officers, from domestic disputes to traffic stops gone dangerously awry.

Jorge Ponce sets out to try and discover the identity of "Medina," a mysterious character who has spent the last 20 years scamming dozens of TV personalities by pretending to be a former colleague with a personal drama.

The chilling story of one of the world’s most notorious serial killers told through the words of Gacy himself, those who were forever changed by his unspeakable deeds and those who believe that the full truth remains concealed to this day.

Dive into unhinged murder cases in which investigators uncover and expose the dark world of cults that kill. The series explores how power and manipulation can lead to extreme actions.

New interviews and an up-to-date analysis of evidence shed light on the 1992 murders of three girls in Spain and their profound impact on the nation.

True-crime stories about murders that take place among close-knit groups of people, including coworkers, neighbors and community members.

This true crime series investigates newfound evidence and unanswered questions in famous criminal cases, such as the murder of Asunta Basterra Porto.

Each episode re-examines a single crime case where unanswered questions still remain. Through original interviews those involved, the evidence is dissected and new theories are presented in a quest to uncover the truth.

Sordid tales of love triangles turn into mysterious whodunits, when one of three entwined in a fatal affair winds up dead. In this risky game of illicit love and secret sex, who will end up paying the ultimate price?

It's spring and fear hangs over west-end Montreal. For weeks, an unknown man has been entering people's homes at dusk and threatening them at gunpoint. He ties them up, robs them and then disappears. Between 2006 and 2009, he committed 13 home invasions, one murder, three attempted murders and one hostage taking; leaving dozens of traumatized families in his wake. Using unusual investigative techniques, the police spend ten years tracking him down. Under the close scrutiny of journalist Patrick Lagacé, the series sheds light on many facets of the story that have remained in the shadows.

Exploring the unbelievable true stories of suspicious deaths by retracing the investigation from start to finish, dissecting the red flags and undeniable evidence, and strange behavior that put the tragedy in question.

People Magazine explores shocking stories of ordinary people who, lured by promises of eternal life, get caught up in a terrifying web of abuse, deception, and manipulation. Explore the deeply disturbing world of cults through the eyes of survivors who managed to escape.