The jury in the trial of Dunedin doctor Venod Skantha has been told the prosecution's key witness is unreliable.
The Crown and defence presented their closing arguments on Tuesday, after hearing evidence from more than 80 witnesses.
Defence lawyer Jonathan Eaton QC did not call any witnesses, instead of criticising Police for carrying out a "blinkered" investigation.
He told the jury that Skantha did not kill Amber-Rose, and was falsely implicated by the Crown's teenage witness, who described himself as a "compulsive liar".
"You don't muck your story up so frequently unless there's a reason for it. And in this case, the only reason could be to deflect his wrongdoing, and implicate [Skantha]," said Eaton.
The defence says the evidence is not credible, and Skantha was not responsible for Amber's death.
Skantha met teenager Amber-Rose Rush in 2017. The 30-year-old junior doctor would invite her and other young friends to parties, and bought them alcohol.
The pair fell out after Skantha allegedly indecently assaulted Amber-Rose and offered her money for sex.
In February 2018, she posted allegations about Skantha on social media, and made threats via text message.
The Crown argues Skantha was the only one with a motive to murder the 16-year-old.
In closing on Tuesday, the Crown says Dr Skantha's life and career were put in jeopardy.
"Amber told Dr Skantha that she was going to tell the hospital and Police about the offer of sex, the indecent assault, and supplying alcohol to minors. And of course she was a minor," said Crown prosecutor Robin Bates on Tuesday.
Already on his final warning at Dunedin Hospital, he was the only one with the motive to kill her.
"Amber and her phone needed to be silenced as soon as possible. Within 30 minutes of that last text or message, she is dead and her phone has been taken," said Bates.
