A 76-year-old man from Barnet, north London, has admitted killing his neighbour’s koi carp fish by poisoning them with oil and detergent. Multiple reports describe the case as being linked to noise from the fishpond, specifically the sound of a pump. The man, identified as Gerry Duffy, told the court he was driven “insane” and said the pump noise affected his sleep, leaving him frustrated due to a lack of rest. The accounts state that he took action against the fish and that he later admitted responsibility. While the reports focus on his explanation and emotional state, they also agree on the core facts: his age and location, that koi carp were killed, the method described as oil and detergent, and the role of the pond pump noise as the reason he gave for his conduct. The coverage does not provide additional details in these excerpts about the investigation timeline, charges, or the outcome of any hearing, beyond the admission itself.