SA is reeling in the wake of news that Adelaide Crows Football Club coach Phil Walsh was murdered overnight.
SA Police confirmed that Mr Walsh was murdered in the early hours of Friday morning at his Somerton Park home.
Just after 2am, police and ambulance crews were called to the house in Bungey Avenue after a domestic dispute.
Ambulance crews treated a seriously injured 55-year-old man at the home but sadly he died at the scene.
The man's son, aged 26, has been arrested but no charge has yet been laid.
He is currently undergoing psychiatric assessment at hospital.
The deceased's wife sustained non life threatening injuries during the incident and is currently receiving treatment in hospital.
Police said Mr Walsh suffered "multiple stab wounds" during the early morning dispute, while his wife suffered a "leg injury".
"There's been an argument, I can't tell you anything about the argument…but as a result of that both Mr Walsh and his wife received the wounds and the wounds ultimately caused Mr Walsh's death," Superintendent Des Bray told reporters at the scene on Friday.
"A knife was used in the attack and that has been found at the scene. At this stage, we won't say what sort of knife, or how the knife came to be there."
Mr Walsh's son left the scene and was found soon after by police in the suburb of Glenelg East, Superintendent Bray said.
"The son was located at First Avenue, Glenelg East, a short time later and arrested for murder and detained for a psychiatric assessment," he said.
"He's now at the Flinders Medical Centre with police."
Mr Walsh's wife is also at the Flinders Medical Centre receiving treatment for non life-threatening injuries.
Superintendent Bray said Mr Walsh's son lived at the Bungey Avenue house with his parents.
"He must have been out or elsewhere and returned at around about 2am," he said.
"Somebody from the house called triple-0 and asked for an ambulance and the ambulance contacted police.
"What transpired I actually can't tell you...I'm sure we will establish exactly what happened and what led up to this tragic event."
It is understood Mr Walsh's daughter is overseas on holidays.
Superintendent Bray said the incident was tragic, regardless of Mr Walsh's high profile.
"It's not even just that he's a high profile person, it's just absolutely terrible when families are torn apart in such tragic circumstances," he said.
"For any family, regardless of who it is, [this is] one of the worst things you could imagine that could happen to you. The pain and suffering of the family is no different."
Sturt CIB and Major Crime Detectives remain at the scene and investigations continue.
The AFL has yet to comment.
