Kind of long but I don't talk about it much so:
When I was a senior in high school a girl I was friends with, A, had just broken up with her boyfriend. He was very manipulative and unstable, so everyone was happy for her. A and I were hanging out one night and decided to go the grocery store to grab some food to toss on the grill. So we hopped in my car and went on our way. Coming back we took a short cut which was a small road, about a mile long, that had nothing on it at all. There were steep embankments on both sides though, that led down into a bunch of fairly large rocks.
Once we turned on to that short cut road, I saw someone speeding up behind me with their bright lights on. I knew it was a truck or another large vehicle because the lights sat well above my little Mustang. I thought it was just a teenager being stupid, but the next thing I know I'm being rear ended and sent down the embankment on the right side of the road. Luckily my car didn't flip, it just sort of nose-dived into the rocks.
A and I were both okay, thankfully, so I unbuckled my seat belt and opened my door to go help her out of the car. Before I could get out I was pulled out by someone. They pushed me on to the ground and started kicking the shit out of me. It was A's ex-boyfriend. I couldn't believe it. He was kicking me so hard that I couldn't catch my breath to get myself up. She eventually got out of the car and ran over to him and he stopped kicking me. Now A is a very petite girl, so he just scooped her up and headed up the embankment towards the road. As soon as I was able, I stood up and made my way up to the road. A was pinned to this guys truck and he was just punching the life out of her. She looked like a rag doll.
My first instinct was to grab a rock and hit this guy with it. He had his back turned to me, so I grabbed a rock that was about the size of a football and brought it down on his head.... Hard. Hard enough that he just went limp and hit the ground. I assumed that I had just knocked him out, but it turns out I hit him too hard. The blunt force had killed him.
We still don't know why this guy did what he did. I guess he saw A and I at the grocery store (small town) and decided to chase us down out of jealousy. The worst part is it didn't even have to happen because I'm gay.
It bothered me for a long time that I killed someone. I couldn't figure out how to make myself let go of the guilt and it really put me into a deep depression for quite a while. Then one day I realized that I didn't need to waste my life being upset, because that guy made the decision to force that chain of events into motion. But ever since that happened I find it hard to watch anything violent just because it stirs up that memory.