A jury heard the recorded call, helping convict the Halls Head man for carrying out the frenzied attack.
“I am f…ing stabbing that c… man,” the jury heard.
“Can you please come?
“He’s f…ing … I’m going to kill him.”
In response to his pre-empted confession, the 000 operator told Walker not to say such things and reminded him the phone call was being recorded.
Just minutes after calling 000, Walker brutally carried out his plan and knifed the 27-year-old father seven times.
A final blow to Mr Boreski’s knee had so much power behind it the blade broke.
The pair met earlier that night in a Mandurah pub before Walker invited Mr Boreski and a friend back to his Halls Head home for a drink.
The pair had an altercation and started fighting in Walker’s backyard before the situation escalated.
Walker told the jury he acted in self defence because he was being pinned to the ground and choked in a scuffle.
The 24-year-old showed no emotion in court as he was found guilty. He is due to be sentenced in May.