Unusual Suspects - Season 5 (2013)

In February of 1992, a Maryland businessman is found shot on Federal land. A veteran US Parks detective follows a trail of clues up and down the eastern seaboard before unraveling the tragic events that led to murder.

When a serial rapist targets St. Louis in the 1990's, a multi-agency task force exhausts countless leads in their search for the mysterious predator. Years later, a concerned citizens helps investigators bring an unlikely culprit to justice.

In 1972, a postal worker is found brutally murdered in his San Diego apartment. Investigators wade through suspect after suspect, from close friends to hardened criminals. Thirty-seven years later, old evidence points them to their killer.

In 1992, a church deacon from Upland, CA is found murdered in Tijuana. Did a secret double life lead to the death of this married father of four? Years later, a fresh look at the case helps investigators unravel the complex plot to murder the deacon.

In 1992, single mother of three Martha Doney is found brutally stabbed in her Las Vegas home. Was she a victim of opportunity, or a target of jealous rage? Years later, modern technology brings the case to a surprising conclusion.

In 1997, four bodies are found in a Bartow, Florida factory, all with close ties to company management. Was it a robbery gone wrong, or premeditated quadruple homicide? Dogged investigation reveals an intricate murder plot and a devious mastermind.

In 1985, the body of an 11 year-old boy is found, days after he disappeared from his father's Flint, Michigan home. A mother's tireless pursuit of justice leads investigators to a crucial clue and the devastating truth behind her son's death.

In 2004, a former marine goes missing from his North Carolina home. Investigators sift through a mountain of tips and small-town rumors before a surprise witness comes forward who may hold the key to the mysterious disappearance.

In 2000, the manager of a Florida hotel is doused with acid in broad daylight. He dies from his wounds 11 days later. Investigators must contend with bum tips, false identities and a nationwide manhunt before the shocking culprit is revealed

In 2005, a fortuneteller and her daughter are brutally murdered in their Westminster, CA home. Ritualistic elements leave investigators baffled until a paper trail leads them to their coldblooded culprit.