Michael Peachey died in Gunnedah Hospital on Thursday evening after being tasered and pepper sprayed by police.
A critical incident investigation is currently being undertaken by police which will then be subject to an independent review.
The death of the 27-year-old father has devastated the family and wider community, with his sister Sally Peachey telling NITV News that he was the rock of the family.
“He was more than a brother to me and our siblings. He protected and looked after everyone.” she said.
Mr Peachey was one of eight siblings and a loving father to a 3-year-old boy, Dwayne.