Pawel Relowicz "laughed" and "smirked" as he was questioned over Libby Squire's death, a jury has heard.
During the seventh day of the estimated month-long trial jurors were told more about Relowicz's police interviews in August 2019 after he was arrested on the suspicion of the rape and murder of the Hull student.
Relowicz had already been interviewed in February of the same year after being arrested on suspicion of her abduction.
The court heard that in the February, Relowicz had given officers a statement denying any involvement in Libby's disappearance.
As he was interviewed again in the August he replied "no comment" to all questions directed at him.
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Richard Woolfall, prosecuting, told Sheffield Crown Court on Friday Relowicz was interviewed three times by officers on August 21, 2019.
The first interview lasted for one hour and 21 minutes.
Mr Woolfall says a statement from Relowicz was read out by the solicitor during the interview.
It said: “I deny the allegations of murder and rape. I was not involved in the disappearance or death of Liberty Squire and have given a detailed account to the police of my movements on January 31 and February 1 and I have nothing further to add at this stage.”
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Relowicz was asked questions but said: “No comment.”
A third interview started with an officer saying: “The only reason she is dead is because you killed her, why are you laughing?”
Relowicz replied: “No comment.”
The officer said: “Why are you smirking?”
He said: “No comment.”
The officer said: “A young woman, Liberty Squire, found dead with no reason to be so because of you Pawel, you raped and killed her didn’t you?”
Relowicz said: “No comment.”
He was charged with rape and murder in October the same year but denies all of the allegations.
The court heard how in August 2019 Relowicz pleaded guilty to nine offences including burglary, voyeurism and outraging public decency.
When he was interviewed about these offences in February the same year, the court was told how Relowicz described them as "silly" and denied them - although he later admitted the crimes.
The court heard more from the victims of these crimes, who described noticing Relowicz "watching" them through their window as they changed and had sex.
The trial continues.