I've met some of the most evil murderers on the planet... but it was a Brit female serial killer that turned my blood cold

A crime expert who has met some of the world's most depraved killers has revealed British psycho Joanna Dennehy was the 'most dangerous' and terrifying.

Ex-commando Christopher Berry-Dee, 76, believes Dennehy, 41, who knifed three men to death in Peterborough and tried to murder two more in Hereford in a murderous rampage in 2013, is 'pure evil'. 

Dennehy launched her 10-day killing spree on March 19, when she stabbed Lukasz Slaboszewski, 31, to death before she went on to kill Navy veteran John Chapman and her landlord Kevin Lee.

The murder of Mr Slaboszewski, a Polish national who struggled with heroin addiction, sparked a furious bloodlust in Dennehy, who later told a psychiatrist: 'I killed to see if I was as cold as I thought I was. Then it got moreish.'

She was named 'the Peterborough ditch murderer' because she dumped all three of her victim's bodies into roadside trenches. Her method of killing was to use a five inch pocket knife to repeatedly stab her victims to death in frenzied attacks.

Dennehy was sentenced to a whole-life term for the cold-blooded murders, which she had 'no regrets' over, as she told her prison fiancée. 

Mr Berry-Dee, who has interviewed infamous killers such as Ted Bundy, Rose West and the Roadside Strangler Michael Ross, said that Dennehy was the 'most dangerous person I've ever, ever, ever come in contact with' and that the way she killed was 'evil'. 

Joanna Dennehy, 41, (pictured) was jailed for life in 2014 after killing three men during a 10-day murderous rampage

Dennehy (pictured) told psychiatrists she killed 'to see how it would feel'

Low Newton prison near Durham is where Joanna Dennehy is currently serving her sentence

Dennehy was  sentenced to a whole-life sentence in 2014 for the brutal murders that shocked the nation

'When I look at Joanna Dennehy, that woman is pure, pure evil,' he told The Sun. 

'She's not actually a big person and the knife she used isn't that big dagger she was pictured holding but a pocket knife measuring about five inches. 

'To walk up to someone in the street like she did and stab someone in broad daylight time and time again the way she did, with blood pouring everywhere… that is just evil.'

The criminologist explained he wrote to Dennehy to find out what made her 'tick' and found out she was very intelligent and could have been a lawyer, considering she was from a good family.

The depraved killer's 'beautifully presented' letters convinced Christopher that he was dealing with a woman who could have done positive things with her life.

'As one of the detectives involved said to me, "you know she was hotwired to become a lawyer or something like that". She was well on her way, she was a young intelligent girl.'

Mr Berry-Dee speculated that Dennehy was furious at the world for throwing away the 'beautiful start' she had in life.

He said: 'She had a beautiful start in life before she got involved with these fairground workers and alcoholics and drinking and drugs and stuff like that. It frazzled her brain.

'She probably looked back and thought, "I've just f***ed my life up and I hate it and I hate the men and I hate everybody in the world".'

The crime expert surmised that her hatred for the world was echoed in the way she cared - or didn't - for her two children. 

He said she never touched her children and 'didn't want anything to do with them' after they were born. 

The true crime author also said Dennehy particularly hated men and that she treated her common law husband 'like dirt'.

Christopher added that Dennehy's 'heartbroken' parents were also victims as they did their best to get her on the right track.  

Dennehy was engaged street robber Hayley Palmer (pictured), who has been released after serving 16 years 

Police issued this photograph of the knife Dennehy used in her three murders

Picture shows sisters Maria and Joanna Dennehy when they were 4 and 6 respectively

In a brief interview, Joanna's mother explained how they tried to get social services involved to help control her daughter but the more they pushed her, the more she 'rebelled'. 

And Christopher believes it was the falling in with the wrong crowd and into drink and drugs which 'fried' Joanna's mind. 

He said: 'It was the alcohol from the fairground workers and the drugs that fried her brain and that was it. The mother was absolutely heartbroken.' 

After she killed Mr Slaboszewski, she left his body in a wheelie bin for several days. 

She then killed John Chapman, 56, who served in the Navy in the Falkland's war before falling on hard times and turning to alcoholism, in the bedsit they both lived in by stabbing him in the heart on March 29. 

The 'man woman', as she was know in her bedsit due to her intimidating persona, then dumped both Chapman and Slaboszewski's bodies in a ditch at Thorney Dyke. 

Her third victim was the landlord of her bedsit, Kevin Lee, 48, who was married with three kids and had employed Dennehy as 'an enforcer' in the property. 

After Lee had confessed to having an affair with Dennehy to his wife, the pair met- just hours after she killed Mr Chapman - at Rolleston Garth, where Mr Slaboszewski had been killed. 

She stabbed him to death with her five inch pocket knife and dumped his body in a ditch beside Middle Road, Newborough. 

Despite brutally murdering three men, Dennehy's bloodlust was still not satisfied.

She travelled 140 miles to Hereford with accomplice Gary Stretch where she randomly stabbed two dog walkers - retired fireman Robin Bereza, 64, and John Rogers, 56. 

Dennehy stabbed them in frenzied knife attacks. Both survived the horrific attacks only because of swift medical intervention.

During her search for further victims, Dennehy posed for photos with a huge serrated knife and bragged that she and Stretch were 'like Bonnie and Clyde', whose gang killed nine policemen in 1930s America.

Dennehy one of only two women in Britain serving a whole-life prison term - the other is Rose West, who killed at least 10 women with her partner Fred West.

The pair were  briefly locked in the same prison, HMP Low Newton, until Dennehy threatened to kill West within minutes of arriving at the prison. 

Lukasz Slaboszewski, 31, was stabbed to death by Dennehy on march 19, 2013

Kevin Lee, 49, who was Dennehy's landlord,  was similarly stabbed to death on March 29

John Chapman, 56, was killed by Denehy on March 29, when she stabbed him in the heart

Dennehy, who covered her body in self-harming scars, is pictured dancing on a balcony

West was later moved to a different prison following the threat.  

Mr Berry-Dee said: 'She was trying to assert herself over West.

'It's a dominance thing. As soon as she went into jail it was like 'Bang! Out you go Rose, I'm in charge'."

Dennehy is also engaged to Hayley Palmer, who she met the the privately-run HMP Bronzefield in Middlesex, but they split after being moved to separate prisons.

Palmer, who is now a free woman after serving 16 years, revealed in 2022 how her her prison fiancée told her she is a 'fully committed psychopath' in a harrowing love letter.

Dennehy also revealed how she had 'no regrets' and how she would 'laugh' about her crimes, in the letter. 

The murderer wrote: 'You have a fully committed psychopath. Together we will travel a path so beautifully dark, so mentally and physically dangerous we will cease to know where I begin and you end.'

The victims of Joanna Dennehy's three-day murder spree

LUKASZ SLABOSZEWSKI

The 31-year-old moved to the UK from Nowa Sol, Poland, in 2005 to work in a DHL warehouse in Peterborough.

Cambridge Crown Court heard that, at the time of his death, he was being prescribed methadone as a substitute for his heroin addiction.

He was last seen alive leaving his home in the city's Lincoln Road on March 19 last year having met Joanna Dennehy for the first time the previous day. He told friends he had found an 'English girlfriend'.

It is thought he was stabbed to death in a property in Rolleston Garth on or soon after this date.

Afterwards, Dennehy stored his body in a wheelie bin for several days before dumping it in a ditch at Thorney Dyke along with that of John Chapman. Their bodies were discovered by a farmer on April 3.

In a statement issued after his death by Mr Slaboszewski's sister, Magda Skrzypczak, said: 'Lukasz was the joker in the family, always finding something to laugh about. His mum and dad are devastated by their loss and he also leaves two grieving sisters.' 

JOHN CHAPMAN

The 56-year-old, originally from Leeds, had served with the Navy in the Falkland's war.

Jurors heard he had fallen on hard times. He was an alcoholic but known as a 'friendly drunk', the court heard. Mr Chapman lived in the same set of bedsits as Dennehy in Bifield, Orton Goldhay.

He described Dennehy, who had been employed as an 'enforcer' by landlord Kevin Lee, as the 'man woman' and friends were concerned for his safety as she attempted to force him to move out, the court heard.

He was killed in his bedsit on March 29 after Dennehy stabbed him in the heart. A photograph of his body, timed at 7.32am that day, was found on Leslie Layton's phone.

Mr Chapman's body was found alongside that of Mr Slaboszewski on April 3. At the time, his family released a statement saying: 'We are all so upset and shocked by the tragic loss of John.

'He was a loving brother, brother in law and uncle. He was much loved by all who knew him and will be missed by all his friends and family.'

KEVIN LEE

Property developer Kevin Lee , 48, was found dead in a ditch on March 30.

The 48-year-old lived in Fletton, Peterborough, with his wife Christina and their two children.

He ran the Quick Let property firm, which specialised in providing bedsits to people of 'limited resources', prosecutors said.

Business partner Paul Creed told the court Dennehy had approached them seeking accommodation. Mr Creed had been reluctant to house her but Mr Lee wanted to 'give her a chance'.

Mr Lee later employed Dennehy as a decorator and enforcer, the court heard. On March 20, Mr Lee confessed to his wife that he was having an affair with Dennehy.

Nine days later, on Good Friday, he gave Dennehy an Easter card. Later that day she called him on the phone and arranged to meet him at Rolleston Garth - where Mr Slaboszewski had been killed - before stabbing him to death.

Mr Lee's body was found by a dog walker in a ditch beside Middle Road, Newborough, on March 30. His family issued a statement saying: 'We are devastated by Kevin's death, he was a wonderful husband, father, loving brother and son.

'His naturally infectious personality touched everyone who knew him. He will be hugely missed by all his friends and family.'