Killer Christopher Halliwell, subject of the ITV show A Confession, may have been responsible for four other unsolved murders, an investigation has found.

The murders of Julie Finley, Carol Clark, Jackie Waines and Yvonne Fitt have striking similarities to the two Halliwell was convicted for, The Mirror reports .

Halliwell, 55, is in jail for the murders of Becky Godden, 20, and 22-year-old Sian O'Callahan.

But a witness told the paper how the killer drove a white van similar to the one spotted at the scene of Julie Finley's unsolved murder.

And he revealed the taxi driver lived less than five miles from the field where the 23-year-old's naked body was dumped in a field in Rainford, Lancs, a day after she disappeared from Liverpool city centre.

Christopher Halliwell may have been responsible for four further murders
Christopher Halliwell may have been responsible for four further murders
The body of Julie Finley, 23, was found in a field in Lancashire on August 6, 1994
The body of Julie Finley, 23, was found in a field in Lancashire on August 6, 1994
Caro Clark, 32, was taken from Bristol's red-light district in March 1993 before being dumped in a rural spot
Caro Clark, 32, was taken from Bristol's red-light district in March 1993 before being dumped in a rural spot

She was found strangled on August 4, 1994, and her murder has remained unsolved for more than 25 years.

The witness has urged police to reinvestigate Halliwell, who is currently being portrayed by actor Joe Absolom in the ITV drama A Confession.

He said: "I think the police should look at this and I am happy to talk to them."

The witness said Halliwell stayed in nearby Aughton where he worked as a window fitter from Monday to Friday before returning to his home town of Swindon, Wilts.

He also claimed the killer drove a 1986 D reg Ford Transit van, just like the one spotted near the scene of Julie's murder.

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A woman going by the name of "Tina" contacted police soon after the killing to say Julie had told her she was going to see a taxi driver.

And a witness claimed a young woman who matched a description of Julie was seen arguing with a man who was trying to force her into a van.

Former murder detective Peter Kirkham said of the possible breakthrough: "When you have got the modus operandi and the suggestion he was living in the area at the time, it makes it something the police should firm up.

"It's worth Merseyside Police have a good look at, and if those things are correct, setting up a cold case investigation."

In all the unsolved cases, the victims were lone women, most likely lured into a vehicle in an urban area before being dumped in a rural spot.

Rebecca Godden, 20, is one of two women Halliwell was convicted of killing
Rebecca Godden, 20, is one of two women Halliwell was convicted of killing
Sian O'Callaghan was murdered by Halliwell in 2011
Sian O'Callaghan was murdered by Halliwell in 2011
Halliwell is the subject of ITV's A Confession, with Joe Absolom playing the killer
Halliwell is the subject of ITV's A Confession, with Joe Absolom playing the killer

Carol, 32, was taken from Bristol's red-light district in March 1993 before being dumped in a canal at Sharpness, Gloucestershire after being strangled or receiving a heavy blow to the neck.

Halliwell lived 40 miles away at the time and was a narrowboat enthusiast who knew a lot about the canals.

Jackie, a 35-year-old mum, was also abducted from Bristol's red-light district before being murdered in 1985.

Mum Yvonne was found in a shallow grave outside Otley, West Yorks in 1992.

A Confession stars Martin Freeman as DS Fulcher and has been watched by more than seven million viewers.