Nathan Wiseman, who was killed in December 2015.
Nathan Wiseman, who was killed in December 2015. Supplied

Fatally stabbed man was in 'vulnerable' position, Crown says

HE was "walking along merrily" and carrying an esky for two new acquaintances.

Less than two hours after Nathan Wiseman was last seen on camera near Noosa Marina late on Boxing Day 2015, he was dead.

Robert John Nott has pleaded not guilty to the murder of 21-year-old Mr Wiseman.

In his closing address on Wednesday, prosecutor Danny Boyle told Brisbane Supreme Court the murder-accused, 41, had little choice but to admit to stabbing the younger man.

The prosecutor said cops caught up with Mr Nott at Nambour Hospital the day Mr Wiseman died.

"He was aware that police had the knife and also his clothes."

Mr Boyle said key issues for jurors included the "vulnerable positioning" of wounds in Mr Wiseman's heart and throat area.

He urged jurors to consider the force used in the stabbing, and whether the older man's jealousy about female friend Leeanne Berghofer was a motive.

Mr Boyle said Mr Wiseman was seen on camera at 11.16pm "walking along merrily" with the other two people.

He said Mr Wiseman's mother saw her son at about midnight - and she described him as so drunk he could hardly walk.

Defence counsel Frank Martin said Mr Nott's drinking history, which began at age 12 in Central Queensland, should not be held against him.

He said the fatal stabbing happened in a different context to how a sober person in daylight might stab someone.

"People were drunk, you know how dark it was there."

Mr Martin said Mr Nott had a cut eye and bruises in his kidney area.

"How did all that happen?"

The defence counsel said a witness heard sounds like "punching" and most probably a screaming female "trying to break up a fight".

Mr Martin said a local resident heard an altercation and a woman saying "I've lost my man, I've lost my man."

Jurors have heard Mr Nott told police the younger man punched him and he stabbed Mr Wiseman to stop the attack.

Justice Peter Davis is expected to finish summing up the case on Thursday. -NewsRegional