THE lead detective in the Becky Godden murder enquiry says he is convinced that Christopher Halliwell is a serial offender and will pursue new lines of enquiry.

Detective Superintendent Sean Memory, who led the reinvestigation into the 20-year-old’s murder in January 2003, spoke after Halliwell was sentenced to a whole life term at Bristol Crown Court today.

Hallliwell was serving a 25-year-sentence for the murder of Sian O'Callaghan in 2011 before being convicted of Becky's murder on Monday.

“Christopher Halliwell is a horrible manipulative man. His defence was absolutely ridiculous,” he said.

"I'm sure that he totally regrets that conversation that he had with Steve Fulcher where he made admissions to both murders.

"That's probably something that he'll live with for the rest of his life and will regret that because from that day onwards he's done nothing but try and move himself away from the criminal justice system, manipulate us the police, and I want to be absolutely clear he had got his just rewards today for his endeavours in killing women.

"I am also very, very clear there must be other victims out there, whether they are sexual offences or other women that he has taken.

"The offending behaviour for killing Becky - it was cold, it was calculating, as the judge said.

"I can't believe that was his first offence, from being a burglar in the 1980s to a murderer in 2003. There was a significant gap in his offending behaviour.

"On top of that, Sian wasn't murdered until 2011 so what happened in the interim eight years?

"He talked candidly in 1985 about wanting to be a serial killer and I genuinely believe that's a distinct possibility.

"I will now seek to review outstanding cases, I will appeal to Christopher Halliwell again to tell the truth for once in your life and come and speak to me."

He said the sentencing had finally brought justice to Miss Godden's family and he was "absolutely delighted" for them.

"We have had a number of calls into the incident room which have given us some new lines of inquiry to follow," said DSI Memory.

"I need to take stock of what Halliwell said. I'm absolutely clearer now on what his method is," said DSI Memory.

"He likes to abduct women, he likes to commit sexual offences, he likes to kill, he also likes to remove their clothing and bury them.

"He is an incredibly dangerous man. He has demonstrated today how dangerous he is. He has no compassion whatsoever, he is a callous, cold killer.

"For me one of the most chilling things is we have testament of how good a taxi driver he was, how he used to pick up young girls and take them home safely.

"I really need to understand where's his trigger. How can he do that one day and then the next day decide he's going to take someone's life?"

DSI Memory said the sentencing had finally brought justice to Becky's family and he was "absolutely delighted" for them.

Asked if there specific cases he was planning to look into, DSI Memory said it was "too early to tell."