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 the killer is. 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, Colorado. 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.