Can death process or heart attack cause ear to go purple and drainage from the back of head/neck?

I had the most unfortunate and tragic experience of seeing my son dead in the morgue. His ear was all dark purple and there was something draining from his neck/back of head. What was/causes that? He died in a mountain bike race from heart fibrillation believed to be caused by an extreme adrenalin rush. He did have a bicuspid heart. He appeared to have no other visible injury from collapse. I'm just trying to understand what little I can.