Taxi driver Christopher Halliwell has been urged by his daughter to give the family of a second woman he is believed to have killed "justice" over her murder.
Natasha Halliwell said her father, who is beginning a life sentence for the murder of nightclubber Sian O'Callaghan, should "do the right thing" and "tell the truth" over the murder of missing prostitute Rebecca Godden.
"He needs to give the other family closure as well and give them the justice they need for their daughter," she told ITV's Daybreak.
The 20-year-old was speaking after her father, of Asbury Avenue, Swindon, Wiltshire, was jailed for life after pleading guilty at Bristol Crown Court to Miss O'Callaghan's murder.
But he escaped justice over the murder of Miss Godden because of a police blunder. Halliwell, 48, admitted to a senior detective that he murdered Miss O'Callaghan and Miss Godden, and even led officers to their bodies.
A High Court judge ruled that the confessions the father of three made during a three-hour period on the day of his arrest were inadmissible because Detective Superintendent Steve Fulcher breached police guidelines governing the interviewing of suspects. The detective, who was leading the hunt for Miss O'Callaghan, failed to caution Halliwell and denied him a solicitor. The ruling by Mrs Justice Cox meant that Wiltshire Police had no other evidence against Halliwell to link him to Miss Godden's murder and the charge was withdrawn.
Ms Halliwell, speaking on Daybreak, said she had received letters from her father but she has not replied to them. She said he had urged her to change her name a number of times. She added: "We have had quite a few letters that have said 'Sorry for putting you all through this' and things like this. As much as I want to hate him, I can't. I pity him and I do feel sorry for him and I hate what he has done but I can't hate him."
Miss Godden's father has hit out at police, saying they had "made massive mistakes". John Godden told BBC News: "It seems to me: Come to Swindon, commit murder and you'll get away with it. And that's the way I feel. I'll never put my trust in the police again. Why should we pay with this pain for somebody else's mistakes? I want proper closure. I want closure. I want justice."
Ms Halliwell said her father had never tried to explain what had happened. "He said to me - because I saw him - he said 'Don't ask me why because I don't know why.' So I don't think he even has an explanation," she said.
Wiltshire Police have vowed to catch Miss Godden's killer and revealed that Mr Fulcher has been suspended pending an investigation by the Independent Police Complaints Commission into allegations of "inappropriate contact with the media". It also emerged that the police watchdog has upheld three complaints made to the force about the investigation, which were not related to Mr Fulcher's alleged misconduct.