I accidentally killed my grandmother. I was visiting my grandparents house, I was about 12 or 13. My grandfather instructed me to put my luggage in the spare room where I would be sleeping. I mistakenly placed the luggage in the wrong room next to the door. My grandmother, who was quite old, entered the darkened room and tripped over the luggage. My grandfather scolded me for hurting my grandmother. She died 3 days later from the fall.
http://www.reddit.com/r/AskReddit/comments/7l82t/ever_kill_someone/