Killer Alan Cowan left friend Ryan Sherry to die after Hogmanay party A man who stabbed his friend and left him to die on the street after a Hogmanay party has been found guilty of culpable homicide. Alan Cowan, 23, chased and stabbed Ryan Sherry following a house party in Glasgow's Springburn on December 31 2012. The High Court in Glasgow heard Cowan acted "like an animal" as he went after the 21 year-old, then left his victim with the blade still in his body. The men were earlier said to have been play-fighting before Mr Sherry left the party. Judge Lord Matthews said after the verdict: "It is amazing how something like this can occur out of the daftest of arguments." Cowan had hosted a Hogmanay party at a flat in Petershill Road, Springburn, he shared with his sister. After a play-fight between him, Mr Sherry and another reveller, his victim became "annoyed" and left the flat. A topless and shoeless Cowan went outside armed with a blade and caught up with Mr Sherry. Cowan then struck a fatal blow with the knife at his friend's shoulder area hitting a major artery. The court heard he left his victim on the street close to the Springburn fire station. Mr Sherry died in Glasgow Royal Infirmary on New Year's Day. In her speech to the jury, prosecutor Leanne Cross said: "After the stabbing, Alan Cowan leaves with not one jot of assistance for his friend." Cowan accepted during the trial that he was responsible for the death and that he was "devastated" at what happened. Lord Matthews remanded him in custody and deferred sentencing until September for reports.