"Hold your family close, never for a second take them for granted for that will be the second you lose them," Quinn Walsh reportedly wrote on her Facebook page on Saturday.

"I have lost half my family in a blink of an eye, nothing will be right with the world again.

"Wanna thank everyone for the support and love, will be home soon to be with my mother and to say goodbye to my one and only hero. x"

Ms Walsh was holidaying in the US on Friday, when her father was stabbed to death in the family's Somerton Park home. His wife, Meredith, was also home at the time.

Walsh's 26-year-old son and Ms Walsh's older brother, Cy, has been charged with murder.

Ms Walsh returned to Adelaide on Saturday and has made no further statement. Mrs Walsh, who was being treated for a minor leg injury at Flinders Medical Centre, was released from hospital on Saturday.

In another development, a taxi driver who may have seen Cy Walsh at about 2.30am on Friday morning in Glenelg East, has come forward to police as they continue to investigate a possible link to the drug ice in the case.

South Australian police refused to comment publicly on the claim because the matter is before the courts, but Fairfax Media understands that detectives are looking into whether the highly-addictive drug played a part.

A photo emerged on Saturday of a smoking pipe that was taken from a car parked at the Walsh home in an evidence bag by police.

Cy Walsh remains in James Nash House, a secure mental health facility, after being transferred from Flinders Medical Centre.

He was remanded in custody after a short bedside court hearing on Friday and is due to face Adelaide Magistrates Court on September 15.

Phil Walsh, 55, was found with multiple stab wounds at his family's home in the seaside suburb 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.

Police are believed to be speaking with a taxi driver who investigators believe may have seen a man with blood on him near the corner of Jetty Road and Brighton Road.

In Somerton Park, neighbours were coming to grips with the death on Saturday.

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."

The Age