Waverley man Michael Vernon Lowe is either a lying murderer who killed with venom in his heart or a victim who used reasonable force to escape a deadly attack, a court has been told.
Mr Lowe, 52, was charged with murder on May 13, 2012, several hours after he stabbed Mr Booth in the chest in Kings Meadows at the home of their joint love interest.
After a night out with friends Mr Lowe made the decision to visit Crystal Wells, who he'd only just split with, after being told she had cheated on him.
He arrived unannounced about 1am and found Mr Booth there.
A fight ensued, Mr Booth was killed and Mr Lowe, who received a head injury, pleaded not guilty to murder on the grounds of self-defence.
Yesterday Crown prosecutor Linda Mason spent more than two hours picking that defence apart in her closing statement.
``He intended to inflict bodily harm because of what he discovered,'' she said.
He would have known, like ``a child would'', that stabbing Mr Booth three times with a sharp knife would kill him.
Whereas Mr Booth had defensive type wounds Mr Lowe didn't.
During the trial Mr Lowe said he'd stepped towards Mr Booth who had opened the front door and picked up a cricket stump.
``If you didn't have a weapon you wouldn't keep coming towards [Mr Booth] you'd run the other way,'' she said.
The reality was Mr Lowe pulled a knife before Mr Booth had the stump and ran towards him, she said.
``[The] Crown's case is he went there with a confrontation, perhaps in mind, with the person who was [Ms Wells's] lover,'' Ms Mason said.
``And when the lover presented himself at the door, he lost it, and he attacked him.''
If he'd gone there for a confrontation he would have taken one of his guns, defence counsel Greg Richardson stated in his reply.
``If you were going with a guilty intent would you take a taxi?'' he asked the jury.
The real reason Mr Lowe went there that night was to check on Ms Wells's safety, he said.
Text messages shown to the jury indicated Ms Wells had been receiving threats from a third party the day before. She had forwarded those messages to Mr Lowe seeking protection.
Mr Richardson said the evidence of the Crown's three eye witnesses was too unreliable for the jury to use.
He accused Ms Wells of being a calculated liar who during the trial perjured herself and tried to ``stick a knife in to [Mr Lowe]''.
Justice Robert Pearce will continue summing up today.