A YOUNG man who stabbed and beat his foster brother to death in their Kwun Tong home has denied murdering him. Office assistant Wong Koon-ko, 20, claims he was provoked into killing Wong Kam-yuen, 39, after a long history of antagonism between them. Outlining the Crown's case to a High Court jury and Mr Justice Wong, Senior Crown Counsel Stevan Cole said the two brothers were both adopted and raised by an elderly couple, Wong Yick-lam and his wife, Ko Yin-hing. Mr Wong Kam-yuen had been married twice and had a daughter and a son from his first marriage. At the time of the incident, he had separated with his second wife and had moved back to live with his foster parents and brother in their Tung Ming Street flat. In the early hours of July 4, 1991, while Kam-yuen was lying in bed, he was stabbed by his younger brother. There was a struggle between them, then Koon-ko went to another room, picked up a large television set and beat his brother about the head with it. Their foster father was woken up by the noise, and was confronted by his younger son. The parents waited until Koon-ko had left the premises before calling the police, said Mr Cole. The defendant made three statements to the police admitting killing his brother, but claimed that he did so because he feared Kam-yuen would kill him and his parents. When charged with the murder, Koon-ko allegedly told police that Kam-yuen had threatened to kill him.