THE detective who helped convict Christopher Halliwell said he can't rule out their being other victims.

Speaking outside court, Detective Superintendent Sean Memory, the senior investigating officer, said Halliwell may have had other victims.

"I am really open-minded there may be others - there is an eight-year gap between Becky and Sian," Mr Memory said.

"I would appeal to Christopher Halliwell, actually, if he wants to speak I'm willing to speak with him.

"I can't rule out that there are other victims, however I have no direct evidence at the moment to suggest there are.

"What I can say is that he's not forensically linked to outstanding cases, however that's not to say he hasn't committed other offences.

"I'm not specifically looking at any one particular offence, but I do want to try to understand why there's an eight-year gap between his offending behaviour.

"Of course there's a distinct possibility there could be further offences."

When asked if he believed Halliwell had the potential to kill others, Mr Memory replied: "I've no doubt. He's demonstrated at this trial his ability to lie, his ability to kill women who both in their own way were very vulnerable.

"Becky because of drugs and her life of prostitution and Sian because she had just been on a night out, had a few drinks and fully expected in the position of responsibility that he had to be taken home as any other taxi driver should have done."

Mr Memory said he did not believe Halliwell's assertion that he confessed to Miss Godden's murder to exact "revenge" on Mr Fulcher.

"Steve was a colleague of mine," Mr Memory said.

"I accept that it was a really difficult investigation for him, the Sian murder and the discovery of Becky's body.

"I'm very grateful to have had the opportunity to put some of those things right and get the right verdict today for everybody involved but particularly the families."