How I deal with death really depends on the situation. For instance, my grandmother is elderly, very frail, I know she does not have a lot of time left on this earth so I visit with her as often as I can. I know I will feel sad when she is gone, I will cry but I will move on because ultimately it was her time to go. My friend Carrie was murdered in January and I still think about it because it's so recent. I feel sad and angry all mixed together with quite a bit of rage. I haven't really gotten over it yet. It's hard.
I have not ever had someone close to me commit suicide. A co-worker's daughter committed suicide a few months ago. She attempted multiple times and received intense psychotherapy. Some people are going to think I'm insensitive for saying this, but sometimes it's better that the person is dead because they will have more peace in death than they would have ever had when they were alive.
Sorry about my rambling, been thinking about my friend. I'm sorry for your loss.