The case of Tracy Allen, a 27-year-old mother-of-two who disappeared in Altus, Oklahoma in 2001, and whose whereabouts remain unknown.

The case of 78-year-old Willie Louise Kellum who was strangled to death in her own home in Camp Hill, Alabama in 2005.

The double murder case of Charles and Kathy Hayes who were beaten to death with a claw hammer in their own home in La Porte, Texas in 1997.

The case of 17-year-old Marisol Gonzales and her unborn son who were shot to death in an alleyway in Cottonwood, Arizona in 1997.

The case of 19-year-old Erika Case who was stabbed to death in Terre Haute, Indiana in 1998.

KElly and Yolanda investigate an Arkansas case of a couple how were shot execution style. A suspect emerges who had a disturbing history with the victms.

The case of 27-year-old single mother Lydia Gutierrez who was suffocated and stabbed to death in her own home in Gallatin, Tennessee in 2010.

The case of Victoria Carr Hollingsworth, whose skeletal remains were discovered in a secluded wooded area called Billy Goat Hill in Chattanooga, Tennessee in 1999.

The case of Carolyn Jansen, whose decomposing corpse was found in a plastic container in Aurora, Colorado in 2005, three years after she had disappeared.

The double murder case of Steven Fisher and Melisa Gregory, who were found beaten to death at Copper Dollar Ranch in Newton, Iowa in 1983.

The case of Diann Jean Hoelscher, whose skeletal remains were found in Waller County, Texas in 1997, eleven years after she went missing.

The case of Kirby Smith, who was shot to death in Columbus, Georgia in 2004.

Pete Mullins is suspected of killing Margie Pointer. What happened to Pete's RV? Has anyone found it and searched it for evidence?

The case of Robin Stone, a 17-year-old pregnant teenager whose skeletal remains were discovered by hunters near Luburgh Lake in Guernsey County, Ohio in 1991.

The case of Alma Noffsinger, who was found beaten to death in her home in Oakwood Village, Ohio in 1981.

The case of 23-year-old Kathy Dean Taylor who was electrocuted in her bathtub with an electric clock radio in Vigo County, Indiana in 1975.