An Indigenous inmate is in a critical conditional after allegedly sparking a violent incident with guards at an Adelaide prison.
Wayne Morrison, 29, was waiting in the admissions area at Yatala Labour Prison for a scheduled court video link appearance at 11.30am on Friday when he allegedly started an altercation with prison staff.
Mr Morrison suffered a suspected heart attack and remains in the intensive care unit at the Royal Adelaide Hospital.
Five officers were taken to hospital after the scuffle, including one female guard who sustained a broken nose.
The officers have since been discharged from discharged from hospital will be receiving ongoing psychological support.
Mr Morrison's sister, Latoya Rule, said the young fisherman and artist is "brain dead".
"They said my brother is going to die. I just went to see him, I miss his voice, he has bruises all over him by the police restraining him," she posted to Facebook.
"He has a young daughter who will now grow up without a dad, nephews who will grow up without their uncle Wayne and an entire family that will grow up without their cousin, nephew, brother and son."
There are claims Mr Morrison was refused health care in the days leading up to the incident.
"He was quite dehydrated. Wanted medical assistance, medical care and the lawyers asked for that apparently," Ms Rule said.
The Aboriginal Legal Rights Movement said it "highlighted concerns for the prisoner's wellbeing" and "made numerous calls to Holden Hill holding cells calling for the inmate to receive medical treatment" after Mr Morrison's arrest.
It is understood Mr Morrison's family is planning protests over the incident this week.
"This is not just another death in custody, this is state sanctioned brutality in the same stream as #blacklivesmatter and deserves the same level of attention," Ms Rule said.
The Prison Guards' Union says it will investigate whether more training is needed for its members, and if the use of tasers would have assisted.
South Australia Police’s major crime division will further investigate the incident.