A JURY has retired to consider the fate of a far north Queensland stockman who has admitted killing his elderly employer.
Robert John Wilson, 61, has pleaded not guilty in the Queensland Supreme Court in Cairns to murdering 88-year-old Mount Carbine grazier David Thornton in March 2010.
Wilson, who suffers from bipolar disorder, has admitted he struck Mr Thornton twice in the head with the blunt end of an axe before shooting him.
Wilson's defence team has argued he was mentally unsound at the time.
In his closing submission today, crown prosecutor Roger Griffith said Wilson's behaviour on the day of the killing, and his changing version of events, indicated he was in control of his actions.
"There is no doubt that Mr Wilson suffers from a fairly common mental illness ... that is not enough (to excuse him)," he said.
Justice Jim Henry told the jurors they could either find Wilson guilty of murder, guilty of manslaughter or not guilty on the grounds of insanity.
The jury retired around 1.30pm (AEST) today.