The retrial of David Bain was adjourned on Monday due to the illness of a juror.
The Crown says David Bain, 36, killed his parents Robin and Margaret and siblings Arawa, Laniet and Stephen at the family's house in Dunedin on 20 June 1994.
The defence says Robin Bain killed the family present in the house before shooting himself.
Evidence has already been given by police and ambulance staff who first attended the scene, and the jury has heard a tape of the 111 call made by David Bain.
Complex evidence about the family computer, which could be crucial in establishing the identity of the killer, was also heard last week.
The retrial, which is due to resume on Tuesday, is expected to take at least three months.