A documentary will be aired on ITV this evening that will show an insight into Joanna Dennehy, who is described as ‘The most dangerous woman in Britain’s prison system’ by the detective that tracked her down.

She was 31 when sentenced to spend the rest of her life in jail in 2014 after admitting the knife murders of Lukasz Slaboszewski, 31, Kevin Lee, 48, and John Chapman, 56, in Peterborough plus two attempted murders in Hereford.

The detective on her case calls her “the most dangerous woman in the prison system”.

In the astonishing documentary it is revealed how Dennehy “continues to draw men in” as she manipulates them from her cell.

You can watch the documentary tonight on ITV1 at 9pm.