Police are investigating if the drug ice was linked to the alleged stabbing murder of Adelaide Crows coach Phil Walsh.
South Australian police refused to comment publicly on the claim because the matter is before the court, but Fairfax Media understands that detectives are looking into whether the highly-addictive drug played a part.
It comes as a photo, by the Adelaide Advertiser, emerged of a smoking pipe that was taken from the Walsh home in an evidence bag by police.
Mr Walsh's 26-year-old son Cy Walsh, who was charged with his father's murder on Friday, remains in James Nash House, a secure mental health facility.
He was remanded in a short court appearance on Friday to the Adelaide Magistrates Court on September 15.
Cy Walsh was transferred from the Flinders Medical Centre in Adelaide overnight on Friday.
His mother, Meredith Walsh, was discharged from the hospital on Saturday morning after she was treated for a minor wound to her leg.
His sister Quinn Walsh flew back from the United States, where she had been on holidays, after the news of her father's death broke.
Phil Walsh, 55, was found with multiple stab wounds at his family's home in the seaside suburb of Somerton Park at 2am on Friday. He died at the scene, despite the efforts of ambulance paramedics.
His son was arrested less than two kilometres away from the home, out the front of a school friend's house in First Avenue, Glenelg East, where he had been regularly staying.
Witnesses to the arrest, who were residents living nearby, were woken by car doors slamming, elevated voices and lights from police cars.
"He was lying on the ground over there," one neighbour pointed across the street to a driveway that he believed still had specks of dried blood on it.
"He was pretty quiet."
Residents in First Avenue had linked the former Immanuel College student to a separate block of units in the same street, which had been known as a place where drugs were regularly used.
The unit was boarded-up after its windows had been smashed in a recent incident.
"When the arrest happened (on Friday) we thought, 'Here we go again'," a neighbour said.
Police said Cy Walsh was not involved in that incident and the man living inside the unit, who did not want to be named, repeatedly denied any connection.
"I have not met him, I have not seen him," he said.
Police patrolled First Avenue sporadically on Saturday having already door-knocked residents on Friday, taking statements from a handful. They also canvassed business along the major thoroughfare between Somerton Park and Glenelg East for security footage to trace Cy Walsh's movements.
A taxi driver who police have appealed to come forward had not been located as of Saturday afternoon.
Investigators believe he may have seen a man with blood on him near the corner of Jetty Road and Brighton Road.
Meanwhile, back in street that the Walsh's called home, neighbours were coming to grips with the death.
The street had been reopened after it was cordoned-off on Friday while investigators forensically examined the scene and seized evidence, including the smoking pipe, a computer and a knife.
A security guard was stationed outside the Walsh home on Saturday with police tape still closing-off the property.
Neighbours spoken to by Fairfax Media did not hear any sign of a commotion inside the home in the early hours of Friday morning.
Most did not know the family that had only moved in in May.
Louise Jennings, who lived two doors down, said she had been "looking forward" to getting to know them.
"They seemed like a lovely family and I'm very sad to hear what had happened," she said.
"The atmosphere here on Friday was so eerie, it was like the earth had known what had happened, it was so quiet."
A further two homes up, nine-year-old Jayden Barkla had hung out his Crow jumper and scarf before kicking the footy in his front yard.
"He was a very good coach," Jayden said.
Major Crime Squad Superintendent Des Bray told reporters on Friday morning that the incident was "tragic".
"It's not ever 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."
