A former top cop who helped put dozens of killers behind bars has revealed which murderer he encountered who scared him the most.
DI Steve Keogh, who worked for the Met Police for more than a decade, came face-to-face with some of the evilest criminals in the country.
But it was double killer Nicola Edgington who he found the most disturbing, the 50-year-old said.
Mr Keogh said he was certain that if she was ever released, she would kill again.
Edgington brutally attacked passer-by Sally Hodkin with a butcher's knife in a random attack just six years after she killed her own mother.
The former detective, who said his team cracked 90% of the murder cases they were assigned, told The Sun : “I have no hesitation in saying that if she was released that she would have done it again.
“She frightens me, to be honest, I have never felt unsafe arresting anyone or confronting them but she is frightening.”
He said that Edgington showed "high levels of narcissism" and "an extremely high sense of her own importance".
On top of that, she was "completely lacking in empathy", Mr Keogh said.
“All she wanted to do was show everyone that she should have been listened to," he stated.
Edgington stabbed her 60-year-old mum Marion nine times in a fatal attack in Sussex in 2005.
She was detained indefinitely under the Mental Health Act but released four years later.
She later pleaded with police and mental health services to detain her, saying she feared she would kill again.
On October 10, 2011, while waiting to be admitted to the Queen Elizabeth Hospital in Greenwich, London, she left through a door that should have been locked.
After buying a knife from Asda she attempted to kill a woman in Bexleyheath - but was disarmed by a member of the public and her victim survived.
But tragically she went on to steal a knife from a butcher's shop, which she used to murder Sally Hodkin.
Edgington was later convicted of murder and attempted murder and ordered to serve at least 37 years behind bars before she is illegible to apply for parole.
