About 11am yesterday Justice Ailsa Duffy told jurors they were excused until 10am Monday. She said the trial was adjourned so she could hear legal arguments from counsel.
Earlier, former Rotorua pathologist Ronald Ensor said in evidence a .22 bullet had entered Mr Tahu's head just above his left eye, causing "irreparable damage" to his brain and causing his death.
Dr Ensor, who performed the post mortem, said in his opinion it was highly likely the shot to the shoulder happened first and "the second [shot] was a finishing off job".
Michael Sullivan, a Turangi police constable at the time, told how he had shared a cup of coffee with Mr Tahu at the Shell station earlier that evening.
He said he got a call about 1.50am from Taupo police and ran the 50m from his home to the service station. There, he found a motorist trying to help Mr Tahu, who was lying in a pool of blood struggling for breath. Mr Tahu died a few hours later in Taumarunui Hospital.
Hallett was charged days later but did not stand trial as the law then meant a wife could not give evidence against her husband. After a 2006 law change the case was reopened and Hallett charged again in late 2011. Hallett's ex-wife Susan Sharpe is listed as a witness for the Crown but is yet to give evidence.