A witness ran to Putt's nearby mother's home and called 111. Ambulance officers attempted to revive Putt for over half an hour, but at about 8am he died.
McKee was arrested on September 26 after being on the run from police for two days.
"The gun used to shoot Mr Putt has never been found by the police," Yelavich said.
Defence lawyer Annabel Ives gave a brief opening statement and said her client admits he was at the Winsford St property and admits the tragic events that occurred, but was acting in self-defence.
"The defendant says he acted in self-defence and if you don't accept that you have to look if he had murderous intent," she told the jury.
She added that McKee also had pointed the weapon at the feet of Putt when it was fired.