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Criminal pathologist Dr Kerryann Shearer said that when she examined the body of Alex Forbes, an ornamental knife, which had punctured his lungs and gone into his spine, was still in place.
But she said the cause of death was blood loss from a wound to the heart, the High Court in Edinburgh heard.
Adrian Hynd, 51, denies murdering Alex, 25, on January 2 by punching and stabbing him with a knife on the head and body.
The jury heard that Alexander was also stabbed on the abdomen, buttocks, lower back and thighs and there were 10 stab wounds on his face, head and neck, some of which were superficial.
Under questioning by Mark Stewart QC, defending, Dr Shearer agreed that some of the wounds could have come from the sharp points on the ornamental knife if two people were rolling about on the floor.