Lloyd Rayney meant to kill his estranged wife Corryn and would not have just injured her and allowed her to "live to tell the story", according to the prosecution.
Prosecutor John Agius suggested that, against the backdrop of the Rayneys' bitter marriage split, Mr Rayney would not have risked arming his wife with "more ammunition" by simply assaulting her.
Mr Agius made the submission as Supreme Court Justice Brian Martin queried whether Mr Rayney's alleged burial of his wife in a secret bush grave could have occurred even if he had unintentionally killed his wife after lashing out in anger.
Mr Rayney is charged with manslaughter - a charge that carries no intent - as an alternative to his wilful murder charge which alleges he meant to kill his wife. The father of two has pleaded not guilty to both charges.
Mr Agius submitted Mr Rayney intentionally killed his wife at home on August 7, 2007 after luring her there from a dance class with bogus claims he was ready to give her much-wanted financial information.
Mr Agius said evidence showed he did not have the financial details she demanded and that he carried out an attack to the back of the head that was designed to kill her and remove her as an "impediment".
Mr Rayney knew simply injuring his wife would have left him in a worse position, he said.
A lack of skin under Mrs Rayney's nails, a lack of bruising on her face and lack of defence wounds showed she suffered an "intentioned and meaningful attack", Mr Agius said, and indicated she was attacked by someone she knew or was surprised. Mr Agius suggested the attack had not come during an argument, with evidence showing Mrs Rayney was a "fighter" and that a daughter in bed at the time had not heard anything.
An attacker other than Mr Rayney would not have risked besetting her at the home where they could have been detected, Mr Agius suggested.