I'm not the emotional type at all, but I watched my mate die recently and its the worst I've felt in my life. My grandparents have all died and I've been effected, aye, but nothing to the extent that I felt this time, and still do. Maybe at the age of 37, I've lead a sheltered life, or maybe its the fact that I witnessed it happening, or that a young family has been left without a dad...or a combination of everything, but its on my mind, each and every day without fail. It happened in the evening and I went to work the next day, and did until the funeral, I took that off and the following day, and my work never questioned me at all as they had known the circumstances.
Each situation is different, and just because the person involved isnt blood related, doesnt necessarily make it any less traumatic.