Schoolgirl Jayde Kendall might have died after consensual sex with the accused went "horribly wrong", a Supreme Court murder trial has heard in Brisbane, as the jury retires to consider its verdict.
Brenden Bennetts is charged with the 16-year-old's murder.
Her body was found on a rural property south of Gatton, covered in grass, almost two weeks after she went missing in August 2015.
A cause of death could not be determined.
Bennetts has pleaded guilty to manslaughter but not guilty to murder.
On the eighth day of trial his defence was presented to the jury.
Barrister Michael Copley suggested Ms Kendall was killed during consensual sex that went "horribly and rapidly wrong".
Mr Copley said his client had a "foolish and dangerous tendency to apply force to the neck" during sex but engaging in such behaviour did not prove the participant intended any harm.
Mr Copley said the prosecution's murder case was based entirely on circumstantial evidence and there was no motive for Bennetts to kill her.
Mr Copley said Bennetts' lies after Ms Kendall's death were consistent with someone who was ashamed of what he had done in accidentally killing her during sex.
"It doesn't look good to know that you did the act that caused her death ... because you are continuing to do this bloody stupid thing," he said.
Crown prosecutor Vicki Loury told the court Bennetts lied to police since they first began questioning him.
"For 13 days only Brenden Bennetts knew that Jayde was dead, for 13 days he let her family search for her — what a web of deceit he has woven," she told the court.
Ms Loury questioned why Bennetts had not called emergency services for help.
"If this was just a case of sexual misadventure ... why didn't he ring triple-0?" she said.
"If it was just a terrible tragedy why didn't he get her help?"
It is understood a verdict will not be taken until Wednesday morning.
