Brian Liston was waiting for a bus when he was approached by a stranger who had no shoes on.
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It was just after 8.30pm on December 10, 2015, and Mr Liston was sitting on a bench on Salisbury Road in Camperdown after his regular German class.
The stranger walked up to him and spoke for about five seconds, then stabbed him in the chest.
Mr Liston, a 51-year-old teacher, began screaming.
"You've just stabbed me," he shouted. "I've been stabbed."
Mr Liston jumped up and attempted to move away, but his attacker followed, grabbing him on the back of the shirt and stabbing him a further five to 10 times.
He attempted once again to run, but tripped over in the street and landed on his back.
Multiple witnesses saw the attacker approach Mr Liston, bend down towards him, and grab his hair with his left hand.
With his right hand, he "slowly and deliberately" stabbed him in the face and neck with a 15-centimetre knife.
From a nearby unit, Paramjeet Pal heard someone scream, "Somebody help me, he is going to stab me to death."
Mr Pal ran outside and saw another man had come to Mr Liston's aid, but the attacker was now confronting the second man with a knife. Mr Pal ran towards the attacker, delivering a "flying kick" to his back, then followed him as he left the scene.
When he finally dropped the knife, Mr Pal grabbed him by the back of the shirt and held him until police arrived.
Mr Liston was rushed to nearby Royal Prince Alfred Hospital but died shortly afterwards from one of the stab wounds, which went into his lung and heart.
William Rodney Cahill was arrested at the scene and charged with Mr Liston's murder.
On Monday, a special hearing into the alleged murder opened at the Supreme Court in Sydney.
The court heard the Mental Health Review Tribunal found Mr Cahill, 29, unfit to stand trial for murder due to his mental health.
Two psychiatrists told the hearing that Mr Cahill has severe schizophrenia.
Dr Richard Furst, a consultant psychiatrist, said Mr Cahill was first diagnosed with the condition in 2006 and since then had spent only "brief" periods out of hospital.
"The accused suffers from a chronic and treatment-resistant schizophrenic illness which is severe in nature," Dr Furst said.
"There is a failure to respond to two different classes of anti-psychotic medications within a reasonable period of time.
"Mr Cahill is on the more extreme end of the illness."
The hearing continues.