The crown has finally closed its case in the trial over the death of Christchurch realtor Yanfei Bao

Tingjun Cao is charged with murder, and is defending himself.

The officer in charge of the investigation, Detective Inspector Nicola Reeves, has been repeatedly denying Cao's propositions during cross examination where he called the CCTV, photos and texts fake.

She called Cao's claim police planted Bao's phone, ridiculous.

Reeves remains adamant her investigation was conducted with integrity.