A man charged in connection to a fatal attack at a Burnaby Starbucks has been found guilty of manslaughter.

A jury at BC Supreme Court has found Lawrence Sharpe guilty in the death of 22-year-old Michael Page-Vincelli.

Page-Vincelli was sucker-punched in the coffee shop after a dispute over a cigarette got out of hand. He died three days later in hospital.

At the time, witnesses told CTV News that Page-Vincelli got upset and lashed out at a woman who dropped a lit cigarette on the ground.

The exchange got so heated, he was seen picking up the cigarette and throwing it at the woman's face.

That's when she called her boyfriend who was in the same strip mall. Witnesses described seeing the man punching Page-Vincelli and the impact caused him to hit his head on a counter.

"They made a mistake, too, not just my son," said Steffany Page, Page-Vincelli's mother.

"They don't even say sorry, they don't own up to saying, 'We're sorry for hurting your son. We're sorry that you'll never see him again.' That's not fair."

Sharpe's girlfriend, Oldouz Pournouruz, was also charged but was found not guilty of manslaughter.

Sharpe will be sentenced at a later date.