Stacey Castor's story is a thing of nightmares spattered with evil, poison, and death.
The wicked mum poisoned her second husband David Castor and tried to kill her own daughter Ashley Wallace in a plot to pin his murder on her.
Her trial is considered one of the biggest in recent history spawning a two-hour 20/20 special on ABC and earning her the nickname "The Black Widow.'
Castor, of New York, was also convicted of filing a fake will to inherit Mr Castor's fortune and suspected of killing off her first husband with poison in 2000.
She almost got away with it too, wanting people to believe that her life had been crippled by tragedy with her first husband dying of a heart attack, her second poisoning himself with antifreeze, and her daughter also attempting suicide.
But police said it was all a lie and she was sentenced to 51 years to life in 2009, never to experience freedom again.
Castor drew her last breath one Saturday morning in June 2016 at Bedford Hills Correctional Facility for Women in Westchester County, New York.
The 48-year-old was pronounced dead at the prison at 6.48am on June 11 and her death was put under investigation.
Castor's taste for death possibly began in the year 2000 with the death of her first husband Michael Wallace, the father of her two children.
His passing was originally put down to a heart attack, but authorities later ruled it was homicide caused by eating or drinking poison – ethylene glycol.
Prosecutors presented evidence to suggest Castor was involved in Mr Wallace's murder but she was never charged.
They argued that she killed both her husbands to collect on their life insurance policies and estates.
An investigation proved that she fatally poisoned her second husband by using a kitchen baster to slip him antifreeze in September 2007.
His body was found in a bedroom at their home with a bottle of antifreeze underneath the bed and a glass of green liquid on the nightstand..
Castor staged the scene to make it seem as though he was depressed, had gotten drunk and killed himself by drinking the toxic liquid, reports MailOnline.
When police were closing in on her, the twisted mum tried to kill her daughter Ashley and frame her for killing both her lovers.
In her foiled plan, she used a teaspoon to feed Ashley vodka, orange juice and prescription pills over a 17-hour window after knocking her out with sleeping tablets.
She then typed a 750-word suicide note on her computer pretending to be her daughter and confessing to the killing of both men, the court head.
Ashley was found on her bed barely breathing by her younger sister Bree the next day.
She denied writing the note which contained the word antifreeze written four times as 'anti-free' – how Castor referred to the poison in her police interview.
Sentencing Judge Joseph Fahey told Castor she was "in a class all by herself" after listening to the harrowing details of her heinous crimes in court.
The US County Judge said she was guilty of the most reprehensible crimes he had ever seen during all his 34 years in the criminal justice system.
Castor was convicted of second degree murder in the fatal poisoning of Mr Castor, attempted murder of her daughter Ashley, and forging her second husband's will.
The inmate professed her innocence and spent years appealing her case with a final attempt lodged in 2015.
