Leary Dalton-Byrne, 18, repeatedly knifed Dean Ward, 45, with a carving knife in Finchley Park, in Birmingham, on June 20.
Dalton-Byrne had asked Mr Ward for a fag and when he said he didn’t have one, the teen started to stab him in the arms and legs.
The victim fell to the floor and the teenager continued the attack before he was dragged away by his pal.
Mr Ward's friend stopped a passing cyclist who called an ambulance but he died a week later from “catastrophic” blood loss.
Just a couple of hours later Dalton-Byrne went to a friend’s house still covered in Mr Ward’s blood.
He boasted: “I have just done an M bro” and gave details of stabbing Mr Ward in the leg and shoulder.
The shocked friend recorded him making the confession on his phone which he posted on social media.
Detectives were alerted to the posts and Dalton-Byrne was arrested.
Dalton-Byrne had protested his innocence but was convicted of murder and possessing a knife following a trial at Birmingham Crown Court.
Judge Paul Farrer QC adjourned sentence until February 1 so he could obtain more information about his background.
Following the verdict there were clashes between the families of the victim and the defendant and Timothy Raggatt QC, defending, said it might help for time to pass “for temperatures to cool.”
Mr Raggatt said: “He is someone with difficulties and has a damaged personality in many ways.
"To be quite blunt whether he comprehends the enormity of what he has done is not exactly clear.”
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