Serial killer Joanna Dennehy promised her prison lover she was her "fully committed psychopath", letters have shown.
Remorseless Dennehy, 39, sent dozens of letters to fellow lag Hayley Palmer, 39, who she had planned to wed.
Street robber Palmer, who has now been released, told The Sun on Sunday that Dennehy laughed and "had no regrets" about killing her three male victims in Peterborough in March 2013.
