A detective investigated a killer known as Black Widow, fearing she might attack again as she prepared to be released.
In 1994, 61-year-old Dana Thompson was sentenced to life in prison for murder by hiding antidepressants in the curry of her second husband, Julian Weber, at her home in Japtun, West Sussex.
Seven years later, the body of Thompson was exhumed after she was found trying to kill her third husband, Richard Thompson, in 2000.
Third husband
Second husband
It could be revealed that she is currently in an open prison and is expected to be recommended for release after the next parole hearing in the coming weeks.
Sources familiar with her case said she was assessed as high risk even before she was convicted of murdering Julian.
Given her history of manipulating, cheating and grooming vulnerable men, officials are concerned about any relationships she has forged, according to sources.
Former Sussex police detective Sean McDonald, who investigated Thompson, said: "There's a good chance she'll be out soon and I think she'll continue where she left off.
"I'm sure she'll sin again and she won't be able to stop herself."
"She has no remorse, but will be a model prisoner and say all the right things.
"Her potential release concerns me and all those involved with her."
She was arrested in 1992 for taking money from her cashier and sentenced to 18 months in prison on 15 counts of fraud.
She married BT executive Mr Thompson in 1999, stole his life savings and spent thousands of dollars on his credit card while forging his signature to get a loan.
When she allegedly beat him with a baseball bat and stabbed him, he was naked and tied up.
Charged with attempted murder, in August 2000, she told the jury at Lewis Crown Court that she acted in self-defense when he discovered she had become violent after stealing his things.
After pleading guilty to 15 charges of theft and dishonesty, she was sentenced to three years and nine months in prison.
In December 2003, after a month-long trial in Bailey Sr., she was sentenced to at least 13 years in prison for the murder of Mr. Weber.
In 2007, the judge extended this period to 16 years. "Whether she is released or not will be decided by the parole board," he said.
"At that stage, it will consider the need to protect the public.
He said she had committed a cold and systematic murder through trickery and without remorse.
Detectives have tracked down eight former lovers, who may have lost £250,000 between them.
A parole board spokesman said: "We can confirm that a parole review has been submitted. A decision is expected later in May. ”