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Ex-commando Christopher Berry-Dee, 76, believes Dennehy, 41, who knifed three men to death in Peterborough in a murderous rampage in 2013, is pure evil .
Christopher Berry-Dee analysed Joanna Dennehy's murderous spree after she knifed three men to death in Peterborough and tried to kill two more in Hereford, calling her "pure evil"
'Britain's most dangerous female prisoner' Joanna Dennehy, who was handed a life sentence in 2014 after her frenzied killing spree, told police she found killing her victims 'moreish and fun'
Lucy Letby (pictured) became one of only four women to be given a whole-life sentence yesterday for murdering seven babies and trying to kill six more.