An inquest into the death of an Indigenous man in NSW custody has heard the young father may have had multiple seizures and was distressed to be separated from his cellmate on his last night in remand.
Tane Chatfield died in September 2017 after being held on remand at Tamworth Correctional Centre for two years.
The 22-year-old attended court in Armidale but was returned to Tamworth after the first day of a hearing on September 19.
Darren Brian Cutmore had been Mr Chatfield's cellmate in the preceding days, but was moved to a different cell that night as the pair were co-accused.
Cutmore told deputy state coroner Harriet Grahame that Mr Chatfield was on the way back to Tamworth from court "happy as can be" as he was confident of being acquitted.
But Mr Chatfield's former cellmate, who considered himself an "older brother" to the 22-year-old, could still remember his reaction when he realised the pair were to be separated later that night.
"He was very upset ... he said 'all we've got is each other and now they've f***ing taken that away from us too'," Cutmore told the inquest on Monday.
Cutmore also said that while the pair had often used drugs in prison together, he did not think Mr Chatfield did so on the night of September 19.
The man who replaced Cutmore in Mr Chatfield's cell, Barry Evans, told the inquest the deceased appeared "agitated" following his separation from Cutmore but he made his new cellmate feel "welcome and comfortable".
Mr Evans, who only met Mr Chatfield that day, said he did not see his cellmate use drugs or hear him talk about doing so.
The former firefighter said he called for help after seeing Mr Chatfield hit the floor.
"It was like he was having a fit," Mr Evans told the inquest.
One of the officers at Tamworth Correctional Centre that day, David Mezanaric, told the inquest he knew of the victim having two seizures on September 19 - one in his cell and one in a treatment room before paramedics arrived.
The victim's mother, Nioka Chatfield, said the grief she felt after the death of her son "became like a chronic illness" and her family needed accountability to move forward.
"I can't tell you how my boy lost life ... there are lots of unanswered questions," Ms Chatfield told AAP after the first day of the inquest.
"I'm only concentrating on the love that will never change for my boy. The boy who I saw smiling down at me when I was tying his laces ... the teenager I saw playing football, and the young 22-year-old who lost his life in custody."
NSW Corrective Services at the time said Mr Chatfield's death was not suspicious, telling his family he took his own life.
Mr Chatfield died after two days at Tamworth Base Hospital on September 22, 2017.
The inquest continues on Tuesday.
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Australian Associated Press