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Police search for an odd-looking gunman seen fleeing after shooting a young mom to death, and uncover a suspect who's not what they expect-with a motive that's impossible to comprehend.

Killer Motive

Murder in the Parking Lot

Family members desperately search for a missing Virginia teenager, not knowing police have a secret: they've discovered his body but refuse to release any info as they untangle an extraordinary motive.

The Art of Death

When a North Carolina preacher's wife is found murdered, police must determine not only who may have wanted her dead, but whether some members of the congregation are mourning -- or trying to cover up their part in the violent crime.

Savior or Sinner

A wife claims she woke up to discover her husband had been shot to death as she slept next to him; police question if she is a shocked and grieving widow or if she's a cunning killer with a twisted master plan.

Waking Nightmare

A Naval officer who rose through the ranks and once questioned terrorists at Guantanamo Bay is found by his wife, dead inside a Florida hotel room.

Domestic Terror

The body of insurance salesman Brian Davis is found alongside a bayou in Calcasieu Parish, La.; police discover that Davis had many secrets, and those closest to him may be involved in the death.

The Best of Friends

A popular chiropractor is healthy one day then dies a painful death the next, so police begin the search for a murderer.

A Healthy Dose of Murder

When an outspoken radio personality and veterans' advocate is gunned down in her own bedroom, investigators try to figure out why.

Motorcycles, Murder and Mystery

When a soldier is gunned down on a dusty street in a California desert town, the investigation tests the bonds of friendship and the limits of family loyalty as police close in.

Deception in the Desert

When a family of four, including two young children, vanish in California, police think they left voluntarily; it takes a decade for the awful truth to emerge: a killer, hiding in plain sight, slaughtered an entire family.

The McStay Family Mystery

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Uncovering the dark and twisted motives that led to gruesome killings in the pursuit of a deeper understanding of the relationships behind the horrific killings and of the psychology of the people who committed them.

S2 E4 | A Healthy Dose of Murder