An eight-month-old baby died after being left inside a hot car for three hours while his parents and grandmother got high on synthetic cannabis, a court has heard.
Isaiah Neil was unresponsive when he was found by his father outside his grandmother's home in Ruatoki, New Zealand on November 2, 2015.
Donna Catherine Parangi, 54, has been charged with the manslaughter of her grandson but has pleaded not guilty.
Isaiah's parents, Shane Neil and Lacey Te Whetu, have both pleaded guilty to manslaughter and are now key witnesses in the case against Parangi, who is Te Whetu's mother.
The Crown's case alleges that Parangi is at least in part responsible for Isaiah's death.
However, the cause of death is in dispute as a post-mortem examination also discovered bruises and a bite-mark on the baby's body.
Mr Neil said that he woke up at around 3.30pm and went outside where he found his unresponsive baby son inside a 'very hot' car.
The panicked father said he rushed the baby inside to wake Te Whetu, but after she said she could still see the baby breathing they put him in his cot and went back to sleep.
At around 6pm the father said he woke up again and found the baby unresponsive and soaked in sweat.
The couple sprinkled him with cold water in a bid to revive him while they waited for paramedics to arrive.
Later, when speaking to Detective Sergeant Max Holder, Mr Neil allegedly said, 'we cooked the baby.'
An examination found that the baby had suffered bruises to his forehead, left side of his body and his abdomen.
He also had a bite mark on his right elbow.
Mr Neil said he had no idea how those injuries occurred and continues to claim the baby died of heatstroke.
Parangi's defence lawyer Susan Gray told the jury that the marks on the baby put considerable doubt surrounding heatstroke being the cause of death.
Baby died after being left in boiling car while his parents got high
Isaiah Neil was unresponsive when he was found by his father outside his grandmother's home in Ruatoki, New Zealand on November 2, 2015.
