Detectives follow new leads gleaned from old evidence; frustrated families hope new science and old-fashioned genealogy will finally reveal the killer's identity.

Frustrated by decades of police silence, one victim's family puts the Oakland County Child Killer case back on the front page; Detective Williams gets a big break in the case; new technology reveals new leads from old evidence.

Decades after four children are murdered, Detroit Detective Cory Williams takes up the hunt for the Oakland County Child Killer; a survivor revisits the pornography mill on North Fox Island in Lake Michigan.

Four children are abducted and murdered in the suburbs of Detroit; after more than 30 years, the families of the four murdered children and author J. Reuben Appelman are determined to find the Oakland County Child Killer.

A reexamination of the 1996 murder of 6-year-old JonBenét Ramsey includes never-before-seen evidence, police interrogation tapes, unsealed documents, more than 500 family photographs, and profiles of chief suspects.

In the Upper Peninsula of Michigan, police Chief Laura Frizzo opens a missing person case to find 51-year-old Chris Regan. Over the course of two-plus years, the investigation turns into a cat and mouse pursuit that ultimately snares a serial killer whom Frizzo describes as pure evil. "Dead North" chronicles the chief's dogged determination to solve the case, one that alludes to cannibalism, reveals human remains and uncovers a deadly love triangle. The docuseries includes extensive bodycam footage and interrogation room conversations, concluding with a stunning confrontation between two women on opposite sides of the law.