The family of an Aboriginal man killed by police during an arrest attempt in north-west New South Wales three years ago left a courtroom angry and in tears as the Deputy State Coroner delivered his findings into the death.

Coroner Hugh Dillon found 44-year-old Mark Mason died from gunshot wounds at his home in Collarenebri in November 2011.

Mr Mason was shot twice by police

He was alleged to be wielding a tyre iron and had been doused in capsicum spray and tasered before the fatal shot was fired.

During the final day of the inquest in Dubbo, the coroner heard doubts raised by representatives for Mr Mason's family as to whether the officer who fired the fatal shots should have used his gun, when Mr Mason had already been doused with capsicum spray and tasered.

The legal representative for Mr Mason's family questioned why more care was not taken to talk to or negotiate with Mr Mason, and said much of the confusion and chaos in the room at the time was of the five police officers' own making.

However the inquest also heard that the officer who fired the fatal shot feared for his life.

The coroner found the officer acted reasonably, as video footage of the incident showed Mr Mason continued to advance on the officer swinging a tyre lever with considerable force.

Members of Mr Mason's family stormed out of the courtroom as Magistrate Dillon gave his condolences and called for reconciliation between police and the Aboriginal community.