A 23-year-old man was accused of killing his father Thursday in Mercer County after the pair got into an argument that turned physical, authorities said. Officers responded to a Twin Rivers Drive North home in East Windsor around 7 a.m. Thursday for a report of an unconscious man, according to a statement from the Mercer County Prosecutor’s Office. The man, 58-year-old Edgar Chavarria, was found lying on the kitchen floor bleeding from his head and face, the office said. He was pronounced dead at the scene. Chavarria and his son, Yu Chavarria, got into a verbal argument Thursday morning that t…