An intense dislike of a business enemy combined with complete trust in his right-hand man led a millionaire property developer to mastermind a murder, a Sydney jury has been told.
Inviting them to find Ron Medich guilty of murder and intimidation, prosecutor Gina O'Rourke SC on Tuesday listed the combined evidence she said proved his guilt beyond reasonable doubt.
She completed her final address at the NSW Supreme Court trial of Medich, 68, who denies murdering Michael McGurk who was gunned down outside his Sydney home on September 3, 2009.
Medich is accused of directing his then-close friend Lucky Gattellari to organise the hit, as well as financing it, and of then intimidating Mr McGurk's widow in August 2010.
Ms O'Rourke said the business relationship between Medich and Mr McGurk began to disintegrate about May 2008 and by February 2009 had become toxic and irreparable.
"At the date of the murder, (legal) proceedings had not been resolved, with each party claiming the other owed him millions of dollars," she said.
The disputes left Medich with hefty legal costs, damage to his reputation and embarrassment, and led to "a strong desire by the accused to have the deceased permanently removed from his life".
Ms O'Rourke referred to evidence about the "intensity" and interdependence in the business relationship and the close friendship between Medich and Gattellari.
One witness described them as being "joined at the hip", saying their opinions were the same, while Gattellari testified to seeing Medich daily, exchanging numerous phone calls, and attending lunches, visiting massage parlours and travelling overseas together.
"You might think Gattellari was prepared to do anything for the accused," she said.
Gattellari testified that Medich asked him to organise the surveillance of his wife and he did; and wanted him to organise the break-in of the house of Medich's brother.
This intensity and trust in their relationship led Medich to grant Gattellari power-of-attorney over his business affairs, including electrical companies in which Medich had invested $16 million, she said.
Gattellari, the key crown witness, received a 60 per cent discount on his sentence after admitting to his role in the murder and helping authorities.
Defence barrister Winston Terracini SC will begin his closing address on Wednesday.