During the trial, the Crown said McKee had arrived at the home - a site of alleged commercial-scale drug dealing - about 7am , carrying a loaded gun and mysteriously wearing a wig.
One of the five witnesses at the scene, Jacinta Monkley, described McKee spotting the car Mr Putt was sleeping in outside, before running out to confront him.
Other's described being woken by shouts of "drop the f***ing gun and fight like a man", prosecutors saying McKee knew Mr Putt just wanted a fist fight as their argument grew heated.
"[McKee] did not leave, he did not fire a warning shot," Crown lawyer Yelena Yelavich said. "The defendant had the gun targeted at Mr Putt and he struck his target."
But the defence painted a picture of a terrified McKee, cornered and trying to get away. There were high amounts of methamphetamine found in Mr Putt's body afterwards, explaining his aggression, defence lawyer Annabel Ives said.
He was also on the run from police at the time, was a regular brawler and may have slept outside the home that night as "security", she said.
Ms Ives described Mr Putt yelling threats and challenging McKee, the younger man begging for help as he backed up against the house, only pulling out his gun when he wasn't allowed to escape inside.
"'Get away from me', Mr McKee was yelling ... 'Get him away from me'," Ms Yves recounted for the jury. Then as Mr Putt moved forward, McKee fired, she said.
"It was Leslie Putt that took a swing and made him flinch in that final second. "What other options did he actually have?"
Mr Putt died at the scene despite the efforts of paramedics. McKee was arrested two days later in Papakura. The gun was never found. McKee will be sentenced in September.
