Halliwell murdered Becky Godden-Edwards, 21, in 2003 and Sian O’Callaghan, 22, in 2011 after he kidnapped them in Swindon, where he worked as a taxi driver. After Sian’s disappearance, Halliwell became the prime suspect due to automatic number plate recognition technology. Detective Superintendent Steve Fulcher broke police protocol in the hope of finding Sian alive, and managed to get Halliwell to confess to both murders.
However, his confessions were ruled inadmissible because DS Fulcher had breached police guidelines when he obtained them and police had to find further evidence to link Halliwell to the murders.
He was found guilty of Sian’s murder in 2012, after DNA evidence was found on her body and blood in his car.
Then, in 2016, he was found guilty of Becky’s murder after detectives painstakingly tracked Becky’s last movements alongside where Halliwell had been at the time, and matched soil on tools in his shed to the soil in the field where Becky was buried.
All this has been playing out on ITV over the past six weeks, with Martin Freeman playing DS Fulcher and Joe Absolom playing Halliwell.
Former prisoner Cody Lachey insisted that Halliwell will definitely be watching – and so will his legal team.
He said that access to contraband like mobile phones is so rife in prison that whenever anything like this is on it is “widely watched by the prison population”.
He told Express.co.uk: “Be under no illusion, Christopher Halliwell will be watching this drama with a keen eye, as will his legal team.
“And many other prisoners will also be watching, especially those on his wing, and not just that but the prison officers that work within the prison.”
Despite being kept separately to the other prisoners in Long Lartin, Mr Lachey claimed they will all be aware he is held there, again due to the number of smartphones in circulation, as well as information coming from prison guards.
He said: “Everyone in Long Lartin will be more than aware that Christopher Halliwell is in the prison, as certain prison officers talk to prisoners or prisoners who have access to banned smartphones will use certain search engines to find out information.
“And whenever there is a prison documentary, prison drama or anything to do with the police or anything to do with the criminal justice system, they’re normally widely watched by the prison population.”
Mr Lachey, who is now an advocate for prisoners, said dramas like A Confession are rarely accurate about prisons or prisoners.
He explained how prisoners are locked up 22-23 hours a day – you eat in your cell and get very little time to socialise with anyone.
However, he supported the drama in that it is “certainly a story that needs telling as Christopher Halliwell is a monster and suspected to be behind other murders”.
Mr Lachey is referring to the suspicion among police officers that Halliwell could have killed dozens more women.
For one thing, they find the eight-year gap between the two murders suspicious.