Malcolm Rewa trial: Court shown video of bizarrely tidy murder scene

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The jury on Malcolm Rewa's murder trial has been shown a 1992 police video of the scene as it was left by Susan Burdett's killer.

A former detective who worked on the case told the court the murder crime scene was unlike any other he'd seen in his career - because it was so orderly.

The video was filmed shortly after Ms Burdett's body was found. The scene in her bedroom was too graphic to show without extensive blurring.

"The bed, and in particular the bedding, was very heavily blood-stained," said Neil Grimstone, who was the detective on the case 27 years ago.

The court has heard that Ms Burdett kept her home immaculate, and Mr Grimstone said the scene of the 39-year-old's alleged murder was also very tidy, and that's what made it memorable.

"This was quite different to anything I had encountered before. It was very orderly, the whole house was tidy."

The Crown alleges Rewa entered Ms Burdett's home through an open window, raped her and bludgeoned her with her own baseball bat.

That wooden bat was shown to the court on Wednesday, but a forensic expert said the evidence to prove the bat was the murder weapon was inconclusive.

"We have analysed several samples from the bat, including some samples of the blood staining, and we haven't been able to obtain any results," said Dr SallyAnn Harbison.

She said the absence of much blood on the bat may have been because Ms Burdett was covered by bed clothes at the time she was killed.

The court has heard that covering his victims' upper half while he raped them was a signature characteristic of Rewa's.

Whoever did kill Ms Burdett was wearing corduroy or denim, according to Dr Harbison.

"It appeared to me that the light switch had been switched on or off by something that was covered in a blood-stained fabric."

One fact no one is disputing in this trial is the DNA match for the semen found inside Ms Burdett's body.

A forensic scientist has confirmed the semen was 300 million times more likely to be from Rewa than any other man in the New Zealand population.