A man who fatally punched a surgeon at a Melbourne hospital has been found guilty of manslaughter after a four-week trial.

Patrick Pritzwald-Stegmann, 41, suffered head injuries when struck by 24-year-old Joseph Esmaili at Box Hill Hospital in May 2017. His life support was turned off four weeks later.

Joseph Esmaili has been found guilty of manslaughter. Credit:Jason South

A Supreme Court jury returned a guilty verdict on Wednesday after 2½ days of deliberations.

Esmaili had pleaded not guilty.