Part 2 :-
Youth was 'operating at level of an eight-year-old'
Mr Stockdale described what happened as "a terrible and violent crime" saying his client was really sad and felt "big shame" about what he had done.
Mr Stockdale also said the teenager had now been diagnosed as having Foetal Alcohol Spectrum Disorder (FASD) and he was also suffering from psychosis at the time of the murder because he was abusing alcohol and cannabis.
He said medical reports found the youth was "operating at effectively the level of an eight-year-old" and that meant he had a lack of consequential thinking and was not able to make reasonable decisions.
Mr Stockdale submitted the youth, who has "been through law", will face traditional punishment whenever he is released from custody.
"He is going to have to go through payback.
This is the Martu way.
He will go to Jigalong in front of elders and they will spear him and hit him with the hitting sticks or branches."
"He knows it will happen and he wants it to happen as soon as possible.
"It's a big stress for him, that it has not happened yet.
"He knows it will help to fix things with the Martu community."
The court heard that since his arrest the teenager had been held in at the Banksia Hill detention centre in Perth, and so far has received only two social visits.
Mr Stockdale said that had made his client's time in custody more difficult than it would be for most other people.
The youth is expected to be sentenced by the President of the Children's Court, Hylton Quail, tomorrow.
The court was told the youth, who turns 18 next week, speaks only a little English and he followed the court proceedings with the assistance of an interpreter.