What is the correct term for an event that leads to a fatal outcome?

The term "fatality" specifically refers to an event that results in death. In the context of the question, when an event leads to a fatal outcome, it directly denotes that someone has died as a result of that event. This term is commonly used in law enforcement, emergency response, and public safety discussions to clearly indicate that a death has occurred, making it the most accurate choice in this context.

Other terms in the list have different connotations. While "incident" can denote any event, it does not specify whether the outcome is fatal or non-fatal. "Outcome" is a more general term that describes the result of any event, not necessarily a deadly one. The term "accident" implies an unintentional event that causes harm or damage but does not inherently imply that a fatal outcome occurred; therefore, it could refer to situations that did not result in death. Thus, "fatality" is the most precise term for an event that leads to death.