“The little things we all take for granted every day. I go to the supermarket and see her favourite biscuits and sweets and I go to put them in the trolley for a split-second, then I remember she is not here.”She is dead. That sends a wave of panic and pain in my chest, just like a knife through my heart.”The only thing I can buy her is flowers for her grave. “Since Becky was found, my future has become very different. Tell me, how can anyone get over such an enormous ordeal and loss? Just pictures and memories, a broken heart and a grave. That is all I have left of my beautiful daughter.”Detective Superintendent Sean Memory, who led the investigation, said: “I am 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.” The police interview of taxi driver Christopher HalliwellCredit:PA Charlie Edwards (left) carrying the coffin of Rebecca Godden, also known as Becky, into Christ Church, Swindon for her funeral service. Credit:PA/PA Karen Edwards mother of Becky Godden talks to the press outside of Bristol Crown Court. Credit:REX/Shutterstock/REX/Shutterstock A killer taxi driver who murdered two young women made his victim’s family’s pain worse by not confessing to her death despite showing police where he had buried her body.Christopher Halliwell, 52, is already serving a life sentence for the murder of Sian O’Callaghan, 22, who he abducted in his taxi as she made her way home from a night out in Swindon in March 2011.He has been told he will now die in prison as police reveal there might be more victims after the killer confessed to a fellow inmate about murdering a girl and asking his how many people he needed to kill to become a serial killer.Halliwell confessed to killing Miss O’Callaghan and took police to her body before offering “another one” and leading them to where he had buried missing prostitute Becky Godden in January 2003. The killer then later denied murdering Miss Godden but was convicted following a two-week trial at Bristol Crown Court, at which he represented himself.He smirked at Miss Godden’s family as the jury of six men and six women returned their verdict on Monday following less than three hours of deliberations.Retired High Court judge Sir John Griffith Williams sentenced Halliwell to a whole life order on Friday and told him he will die in prison.Passing sentence, the judge described Halliwell’s account of Miss Godden being buried in the field by two drug dealers as a “cock and bull story”.He added: “Your account of the circumstances in which she met her death bears all the hallmarks of a contrived explanation designed to avoid conviction in the hope that the minimum term you are presently serving will not be increased.”But the account in which you advanced so glibly with little or no regard to the truth made no sense at all.”I have had the opportunity of observing you throughout the trial and listening to your evidence. I have no doubt that you are a self-centred and domineering individual who wants his own way. You are both calculating and devious.” Becky’s mother Karen Edwards said she spent years searching for her daughter until police told her the devastating news on what would have been her daughter’s 29th birthday.”That feeling of total devastation, disbelief, loss, pain, the flash of sudden panic that hits me in the stomach and just repulses me. It has changed my world. The world as I knew it has been totally destroyed and will never be the same, complete, ever again,” she said. “I will never be able to give her a hug ever again and make things right for her, or take her shopping, brush her hair, have a moan at her for not keeping her room tidy or taking my make-up.”No waiting up half the night for a phone call to pick her and her mates up after a night out. Christopher Halliwell has been found guilty of Becky Godden’s murder.Credit:PA/PA Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.