American Monster - Season 3 (2018)

Never-before-seen home movies reveal the fabulous lifestyle of Lanny & Donna Horwitz raising their only son Radley in their Florida mansion. But when their lives are upended by a ghastly shooting, everyone in this eccentric family becomes a suspect.

The Laffertys are pillars of the Mormon community, and known as a flawless example of wholesome family values, as seen in these never-before-aired home videos. But an evil is lurking that - decades later - will explode into an unholy double homicide.

US Air Force sergeant Nathan Paet and his family appear to live a blissfully normal life - as these never-before-aired home videos attest. But blind greed would bring about the destruction of this loving family.

In Oklahoma, Dr. John Hamilton and his wife Susan are the envy of all: successful, respected and in love - until a vicious Valentine's Day murder destroys their lives. Never-before-seen home videos shed light on a brutal murder no one saw coming.

At a family-run construction company, brothers & cousins work hard together - & play even harder. But when one of them vanishes, no one has answers. The mystery of his disappearance - & the salacious betrayal behind it - isn't solved for 20 years.

A father-of-two disappears right before starting a new job; his wife has no idea where he went, while his friends hint that he led a secret, sordid life; the man's disappearance remains a mystery for years until a tip reveals the jaw-dropping truth.

An obsessive video blogging and mother of five shares every detail of her rollercoaster life with her husband and their children online. But one night, intruders tie her up and kidnap her husband and execute him. It seems someone has been keeping secrets.

Coming home from church, a preacher find his wife stabbed and beaten, the apparent victim of a home invasion. The preachers alibi is rock solid, and his son's alibis are sound as well. However, .

A fun-loving couple, both business-owners, share a close relationship with their grown daughters. So when the mom is found gruesomely bludgeoned to death in her own home, no one suspects the unthinkable. But unlike guilty people, video doesn't lie.

A frantic 911 call regarding an unresponsive male lying in his driveway led the police to Marie Strickland's house in Tellico Plains, Tennessee. Her husband, Michael Strickland, was the victim, and a distraught Marie had no idea what happened. But as the authorities dug deeper, they learned of a complex web of personal relationships that meant multiple people had a motive to kill Michael. Investigation Discovery's "American Monster: Double Cross" chronicles how the police zeroed in on Marie as the suspect.