Police are investigating if the drug ice was linked to the alleged stabbing murder of Adelaide Crows coach Phil Walsh.
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Fairfax Media understands that detectives are probing if the highly-addictive drug played a part in the death. A photograph has emerged appearing to show some kind of smoking pipe was taken from the scene in an evidence bag by police.
Cy Walsh, who on Friday was charged with his father's murder, has been transferred from Flinders Medical Centre overnight to secure mental health facility James Nash House.
He was remanded in a bedside hearing that was phone-linked back to the Adelaide Magistrates Court on Friday afternoon. His next court date is in September.
His mother, Meredith, was treated at the same hospital as her son where she was taken with a minor wound to her leg before being discharged on Saturday morning.
His sister, Quinn Walsh, is flying back from the United States where she was on holidays before the tragic news of her father's death broke.
Phil Walsh, 55, was found with multiple stab wounds at his family's Somerton Park home at 2am on Friday. He died at the scene, despite the efforts of ambulance paramedics.
Cy Walsh, a former Immanuel College student, was arrested less than two kilometres from his family's home near a school friend's house where he regularly stayed.
In that same street, First Avenue, is a collection of units. Police are investigating if Cy Walsh is linked to one of the units, known to residents as a place where drugs were being regularly used.
The unit is boarded-up, its windows had been smashed in an attack involving an axe just two weeks ago.
"A man had smashed four windows up there," one neighbour said. "When the arrest happened (on Friday) we thought, 'Here we go again'."
Police said Cy Walsh was not responsible for the axe incident. A resident of the unit in Glenelg East denied reports that he was linked to Cy Walsh.
"I have not met him, I have not seen him," he said.
Witnesses to Cy Walsh's early-morning arrest heard elevated voices, car doors slamming, but bizarrely, the sound of a man laughing before they ventured outside their homes to see what was happening.
"He was lying on the ground over there," a neighbour pointed across the street to a driveway that still had specks of dried blood on it.
"He was pretty quiet."
South Australian Police have appealed to a taxi driver who may have information that could help their investigation.
"Police have information that a taxi driver saw a man, who may have had blood on him, near the corner of Jetty Road and Brighton Road about 2am today," police said in a statement on Friday afternoon.
Police don't know the taxi driver's name or which company he works for and are appealing for him to come forward.
Meanwhile, Sunday's match between the Adelaide Crows and Geelong Cats has been cancelled out of respect to Walsh.
Earlier, Superintendent Des Bray told reporters outside Walsh's home that a knife was used in the attack.
"At this stage, we won't say what sort of knife, or how the knife came to be there," he said.
Superintendent Bray said the incident was tragic, regardless of 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."
Shocked Adelaide Crows players arrived at Adelaide Oval on Friday morning for a team meeting. Meanwhile, shocked fans placed flowers and tributes - a scarf, jumper and a team photo - to Walsh outside the club's headquarters.
An emotional Adelaide CEO Andrew Fagan and club chairman Rob Chapman fronted a media conference on Friday afternoon and spoke of the club's grief.
Fagan said "the impact that Phil Walsh has had on this club will be remembered forever. It won't ever be lost."
He said the players would want to get out there and play at some stage but the weekend was too soon.
Chapman said the day was "all about wrapping our arms around" the football community.
He described getting a phone call at 3.30am about the incident.
"To say that a tragedy had unfolded and that it involved Phil Walsh, our coach," Chapman said. "It's a phone call nobody wants to get."