A court has been told that an unemployed man repeatedly stabbed his former girlfriend before slitting her throat.
Alicia McCallion, who was 23, was found dead in a sleepout at the back of her parent's Papakura home in December 2012.
Karl Eddy, 40, is in the High Court in Auckland charged with murdering Ms McCallion. He denies the charge.
The court was told the accused man left a bloody fingerprint on the front door of his girlfriend's home on the morning of her death.
Crown prosecutor Nick Williams told the court on Monday that the couple had broken up after being together for two years, but Mr Eddy wanted to reconcile, and he bought Ms McCallion a ring.
Mr Williams said Ms McCallion rejected his advances.
He said in the days leading up to the murder, Ms McCallion told her neighbour that Mr Eddy had said he would kill her and any new boyfriend she began a relationship with.
Mr Williams also told the jury that Ms McCallion had told a friend that Mr Eddy would get angry when he had no drugs, and she broke up with him because she was sick of being afraid.
He said that DNA evidence gathered from the scene suggested Mr Eddy struggled with Ms McCallion before he repeatedly stabbed her and slit her throat.
Mr Williams said the police also found DNA linked to Ms McCallion underneath Mr Eddy's fingernails and vice-versa.
He said while Mr Eddy was on remand in Mt Eden prison, he discussed a map and a serrated item in a call to a friend.
The phone calls were recorded and Mr Williams says the police went to the motorway on-ramp descried in the call and found a serrated knife he says Mr Eddy used to murder Ms McCallion.
The trial, before a jury of eight women and three men, will hear evidence from 50 Crown witnesses. It is set down for three weeks.