An accused murderer had demons in his head commanding him to "attack the prosecutor yesterday", his Supreme Court murder trial has been told.
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Alex Reuben McEwan is charged with the murder of Korean woman Eunji Ban in Brisbane's Wickham Park in 2013.
The trial has been adjourned twice due to Mr McEwan's current health.
Justice Jean Dalton today told the jurors they would need to decide whether the 23-year-old is currently fit to continue with his trial.
Forensic psychiatrist Doctor Julian Dodemaide told the jury Mr McEwan has been suffering increased hallucinations and anxiety since the trial began last week.
He said McEwan has seen demons called "Jazzy" and "Dren" who can issue "commands to harm himself and others".
"He stated that as recently as yesterday, he was receiving commands to take his own life," Dr Dodemaide said.
"He said Jazzy gave a … command to attack the prosecutor yesterday."
"I take it he means me?" Prosecutor David Meredith replied.
Justice Jean Dalton said the jury would be asked if McEwan was sufficiently of sound mind to be fit for trial.
"It is important to understand, it is a trial within a trial," Justice Dalton said.
"It will be your decision whether the accused is fit for trial or not."
Justice Dalton said it is not a determination of Mr McEwan's guilt or innocence on the murder charge.