A man has been found guilty of the manslaughter of a teenager at a Perth house party.
Abraham Keung Cross, 36, had been on trial in the West Australian Supreme Court accused of stabbing 19-year-old Callum Pinner in the throat during a scuffle outside a Doubleview house.
On Tuesday, the jury found him guilty of the lesser charge of manslaughter, rather than murder.
Members of the public gallery wept and called out when the verdict was delivered, prompting Justice Stephen Hall to tell them to be quiet.
Cross was also acquitted of unlawfully wounding a man with intent to cause grievous bodily harm, and an alternative charge of causing bodily harm.
During the trial, the court heard several witnesses saw Cross lunge at Mr Pinner's neck with a small knife that he had previously kept concealed.
Mr Pinner bled to death in the street within minutes.
Defence lawyer Anthony Eyers had argued Cross was catching up with his friend, Shaun Peter Donaldson, while he waited for his girlfriend to pick him up, when the pair were mobbed by a group of up to 10 drunk teens.
Prosecutor James MacTaggart denied the assertion and said Cross had no reason to be hanging around a party for young people when he could have waited at the house of Mr Donaldson's mother nearby.
Mr MacTaggart said Cross had berated a drunken teen who was being assisted by friends in the front yard, and had said derogatory things to girls at the party.
Outside court, family friend Debbie Bushell told reporters the family were heartbroken and disappointed with the verdict.
Ms Bushell said the teenager was an outstanding young man and a role model.
"His life was taken away in such a senseless and brutal way," she said.
"His loving family and friends who valued and admired him deeply will never be the same."
Ms Bushell said the family hoped the maximum penalty would be handed down.
Cross will be sentenced on Friday.
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