When Pam Shelly, 31, is found in her Cuero, Texas bathroom with a fatal gunshot wound to the head, her death is initially ruled a suicide. Yet a tenacious investigator's instincts and his suspicion of foul play eventually cracks the case wide open.

When a Christian ranch hand, Dan Lavigne, 52, is shot dead on his porch in Montana, 2002, deputies find no shortage of suspects. What follows is an 8-year quest for justice that stretches across three states before police finally unmask Dan's killer.

In the shadow of the Rockies, Carolyn Jansen, 43, is found dead, stuffed into a duct-taped container. Detectives have two suspects but no clear way to tell who is the killer. Forensics, and a fearless DA, will finally reveal Carolyn's murderer.

When beloved matriarch, Sherry Black, 64, is murdered in her rare books store in Salt Lake City, investigators suspect theft as the motive. The case goes cold until her daughter teams with a wily investigator to bring Sherry's killer to justice.

In 1987 Carol Murphy, 28, is found by hikers slain in a wooded area of Lefthand Canyon, CO. Police uncover a turbulent love life and plenty of suspects in this Western enclave. It will take 20 years and a new technology to finally solve her murder.

When a mystery woman's burning body is found in an oil field in 2006, the rural community of Kilgore and a determined Texas lawman show why you don't mess with the Lone Star State. It takes 13 years to ID this Lavender Doe and nab her callous killer.