The Mark of a Killer

Stories of couples who commit terrible crimes after their relationships devolve from love into manipulation, including what ultimately leads to a fatal breaking point.

Deep into some of the most chilling murder cases in New York City's recent history.

Hosted by Lt. Chris McMullin, the 10-Episode docuseries delves into the most harrowing murders committed in one of the country’s most historic regions.

Review some of the most controversial court cases through the eyes of the original jurors.

Among serial killers, Israel Keyes is an enigma. When police picked him up in Texas in March of 2012, it was for the murder of 18-year-old Samantha Koenig, whom he had brazenly kidnapped from a coffee stand in Anchorage, Alaska. Once in custody, however, he confessed to other murders and bank robberies and alluded to many more crimes. He ultimately claimed to have killed up to 11 victims between 2001 and 2012, but couldn't - or wouldn't - tell the authorities exactly when and where. He told them enough, however, for them to take him seriously. Then, in December 2012, after nine months in custody, he killed himself, taking his secrets with him to the grave.

Investigates burgeoning romances from their sweet beginnings, and follows what happened all the way through to their bitter endings.