Hunting the Long Island Serial Killer

Before disappearing into the darkness of a private oceanfront community, Shannan Gilbert frantically calls 911, leading to a police search and a grisly discovery.

Investigators uncover a series of graves while searching for Shannan Gilbert. The hunt for an elusive serial killer begins.

The killer taunts the sister of one of his victims, providing new leads for investigators.

Police make yet another series of gruesome discoveries and an autopsy by famed forensic pathologist Dr. Michael Baden challenges the official theory of the Shannon Gilbert case.

Authorities turn to new technology to unlock DNA secrets stored in a crime lab for a decade.