The Netflix doc follows the tragic case of 34-year-old Shanann Watts, who in 2018 went missing along with her two young daughters in Frederick, Colorado.
Her disappearance was reported by a friend, who dropped Shannon off at her family home and became concerned when she didn't hear from her the following day.
The mum-of-two was pregnant at the time, and the strange disappearance of two children and their expectant mother gripped America.
As the case became the eye of a media storm, Shanann's husband, Chris Watts, played the part of a bereft father and husband, doing camera appeals to plead for his family's safe return.
In interview tapes played during the trailer, he can even be heard asking: "Did I cause this? Did I make her feel like she needed to leave?"
In reality, Watts was the murderer. He murdered his whole family in cold blood, brutally killing Shanann along with four-year-old Bella and three-year-old Celeste, before concealing their bodies in an oil tank.
Now, Netflix has delved back into the case to give Watts' victims a voice, using archived footage, social media posts, recordings, messages and home videos to tell the harrowing story.
On watching the documentary, devastated viewers who watched the programme took to Twitter to share their thoughts.
One emotional Twitter user wrote: "BAWLING my eyes out watching American Murder: The Family Next Door... only a MONSTER could something like that. I hope he rots in a cell for the rest of his life."
While another viewer commented: "just watched American Murder and I'm actually bawling."
"I just watched the American Murder doc on Netflix and I am fucking bawling," chimed in a third.
BAWLING my eyes out watching American Murder: The Family Next Door... only a MONSTER could something like that. I hope he rots in a cell for the rest of his life.- Shay Bae Bae (@shayhattaway) September 30, 2020
just watched American Murder and I'm actually bawling- amanda :sunflower: (@n0tamandabrooke) October 1, 2020
I just watched the American Murder doc on Netflix and I am fucking bawling- pumpkin head (@missdenae_) October 1, 2020
Watts maintained his innocence until he eventually confessed to his crimes in November 2018, after failing a lie detector test.
He went on to receive three consecutive life sentences and does not have the possibility of parole.
American Murder: The Family Next Door is available to watch on Netflix now.
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