Reports say a man, identified as Gerry Duffy, kills a neighbour’s koi carp by using oil and detergent. Multiple outlets describe the incident as being linked to an ongoing dispute between neighbours over noise, with Duffy previously complaining to the neighbour. Both accounts state that Duffy indicated he would act if the neighbour did not address the problem, referencing comments made in advance of the killings. The reports also describe Duffy’s actions as deliberate, with one outlet adding that he climbs over a fence to reach the fish. The underlying trigger is described consistently as the noise complaint, but the exact circumstances of the noise and the sequence leading to the animal deaths are not detailed in the provided summaries. Together, the sources present a scenario in which repeated neighbour complaints over noise culminate in the use of substances to harm or kill the koi carp, resulting in a confrontation that escalates into property and animal damage.