A spokesman for Mr Tahu's family, Colin Hair, said the family would "certainly be taking a keen interest in things" but he did not know whether they would attend Hallett's trial.
"We sort of knew it was happening, we have had to go through the name suppressions and the hearings and the rest of it.
"But we are all taking a deep breath and sitting back on this one, we are sitting back and letting the system do its thing."
Justice Geoffrey Venning remanded Hallett on bail for a callover on May 31.
Hallett, who was accompanied by a woman to court, looked calm in the dock yesterday. He refused to speak to reporters as he left the court.