Justice Brewer said he had to adjourn two other murder trials last year because of difficulties in getting pathology reports.
"I did that with extreme reluctance in those two cases because these are the sorts of cases that must be resolved as soon as possible for justice to be done. If this turns out to be a third I would be asking an inquiry be made into the pathology system and forensic pathology system."
Mr Brewer said this type of trial must be given priority.
"It has been before the court since at least August last year and if I have to adjourn it it is unlikely I will be able to find a date until well into 2017."
He said trials of this nature were scheduled 10 to 12 months in advance and the Criminal Procedures Act provided for a system where pre-trial problems could be raised at callovers to ensure trial dates were maintained.
If Mr Schulze thought it would be impossible to get another pathologist by May 2, he was to write to the court requesting an adjournment, Justice Brewer said.
"I would only grant an adjournment if I was satisfied that the defendants would be unlikely to receive a fair trial in the absence of a forensic pathologist being available to assist the defence."
Harry Edward represented Haerewa and said he would be ready to go to trial on May 2.