A police statement said his death would now be handled by the coroner and they would not be making any further comment on the circumstances of his death until the results of an inquest.
Detective Inspector Dave Lynch said while there was a strong inference that Mr Mowatt was connected with the double shooting at Ponga Road, the investigation is continuing and no conclusion has been reached.
"We appreciate the high public interest in the case, however, we still need to work through our investigation process," he said.
"This includes forensic work which may take some time before the results are known."
Questioning with those connected to the all three of the deceased will continue this week.
It is believed Mr Mowatt, a former boyfriend of Ms Stanton, shot her and Mr Waite after following her to Mr Waite's Opaheke home and finding them together.
Mr Mowatt, a father of three, was found dead near his car at Woodhill Park last Wednesday.
At Ms Stanton's funeral yesterday she was described as having a "smile that would light up a room".