On the first day of the hearing, Deyanov denied murder and said he was haunted by voices.
"Sometimes they (voices) tell me to kill, sometimes they tell me to fight, sometimes they tell me to hit, sometimes they tell me to pray," a female interpreter told the courtroom.
"I ask you to see my client as a sick man rather than a killer," Deyanov's lawyer said.
CCTV footage of the assault was shown in court.
"It might be quite tough evidence, but it is the best way to see how the incidents happened," the prosecutor said.
Presented by Adam Justice