D.I. John Barnaby is a fictional character from the British television series Midsomer Murders. He serves as a detective inspector in the fictional English county of Midsomer, known for its picturesque villages and hidden crimes. Barnaby is characterized by his keen investigative skills and a calm demeanor, often solving complex murder cases. The character was introduced in the series as the cousin of the original detective, Tom Barnaby, and took over the lead role after Tom's retirement. D.I. Barnaby is portrayed by actor Neil Dudgeon and has become a central figure in the series, continuing the legacy of crime-solving in Midsomer.