Final answer:
Without specific details of the story, it's not possible to identify who was killed in an accident at work, but the incident reflects themes of unexpected loss, grief, and the impact of such events on characters' lives.
Step-by-step explanation:
The question pertains to a character who was killed in an accident at work in a story. Without the context of the specific story, it is impossible to definitively answer whether it was a) the protagonist, b) the boss, c) a co-worker, or d) a family member.
However, if we refer to the provided information that a child witnessed the incident while playing video games with his aunt, and the mention of tragic nights, we can surmise that the story deals with sudden and unexpected losses that profoundly affect the characters involved. The dynamics contributing to these outcomes could involve neglect, inadequate safety measures, or sheer accident, all pointing to themes of grief and the fragility of life.
Prevention of such tragic events could entail stricter safety regulations at work, better supervision of children, or awareness of mental health issues that might lead to such accidents. These are the general interventions that could help avert future tragedies similar to the ones described in the story.