The Crown alleges Hallett shot Mr Tahu twice, once in the shoulder and a second shot to the head.
"The accused looked down on Mr Tahu injured on the ground," said Mr Pilditch.
"He took aim for a third and final time with a certain knowledge that pulling the trigger would end his life - and Mr Hallett pulled the trigger."
"The Crown's case is that he is guilty of nothing short of murder."
This morning Hallett's defence didn't call any witnesses.
In his closing submission, defence lawyer Paul Mabey QC said the jury need to remove all their emotion from their decision making.
In his opening last week, Mr Mabey told the jury Hallett accepted he was the man who shot Mr Tahu but the issue would be whether it was murder or manslaughter.
Court has now been adjourned until 10am tomorrow morning, when the judge will sum up the case before sending the jury out to consider its verdict.
- more to come