Best of Crime Exposé with Nancy O'Dell

Time can bury evidence, but it can also reveal the truth. A mother's execution remains a mystery for four decades until witnesses finally speak; a young woman's murder is reopened thirty years later through forensic genealogy; and advances in DNA expose the man behind a killing that haunted investigators for decades.

Some killers never intend to pull the trigger themselves. A pregnant mother is targeted in a plot designed to collect her life insurance. A young wife's murder exposes a conspiracy driven by a family determined to destroy her marriage. A bitter divorce raises suspicions that a brazen daylight killing was carefully arranged.

For some killers, murder is a final act of vengeance. A mother becomes the target of an ex-husband consumed by a bitter custody battle. A rejected man's anger turns deadly on an isolated trail. Three killings rock the Texas justice system when a disgraced official sets out to punish those who destroyed his career.

Family, sometimes, it's the shelter from the storm; sometimes, it's the storm itself. A husband's sudden death exposes a conspiracy within his own family; a bitter divorce and custody battle ends with a young mother murdered; and when a family matriarch disappears, investigators uncover a deadly conflict unfolding inside her own home.

Nothing is what it seems when killers build their crimes around a lie. A husband claims his murdered wife was the victim of a mysterious gunman; a staged drug deal attempts to conceal a killing fueled by jealousy; and a wealthy entrepreneur appears to die in a devastating fire, until investigators discover the truth.

Murderers can destroy evidence, invent stories, even impersonate the dead - but their digital footprints remain. A photograph conceals the clue to a young waitress's killer; cell phone records and surveillance technology unravel a double murder; and a missing woman continues to send messages for years, until investigators discover someone else behind the screen.