Has anyone you know died a tragic death and it made you think about the seriousness of life?

My sister was hit and killed by a car. It was my fault. My parents should of picked her up from school but I was having issues at school and I couldn't ride the bus. So they had to pick me up. It was cold and rainy that day. Car going to fast lost control and hit her on the sidewalk. She died before anyone could help her.