Three others - Vila Lemanu, Lionel Tekanaw and Terence Tere - have denied destroying evidence, namely setting fire to a Nissan 4WD in the days following Mrs Wang's death.
A jury of nine women and three men were chosen to hear the trial this morning.
Justice Timothy Brewer told them the accused were facing a retrial but warned them not to go to the internet to "surf around''.
"These accused are entitled to have you decide the case against them solely on evidence that you heard called in this courtroom.''
The reasons for the retrial have been suppressed.
He adjourned the trial to Wednesday because "some matters had come up'' which he and the lawyers needed to deal with.
The trial has been set down for five weeks but Justice Brewer said it could be over in less than four weeks.
Mrs Wang died in hospital from head injuries after being knocked down by a four-wheel drive in the carpark of the Manukau Westfield shopping centre.
Her 8-year-old son witnessed the incident.