Ive been through a suicide of a close relative and the murder of my brother in front of me. I h ad a hard time with the suicide because she shot her self in my apartment and my husband who was a minor was working out of town when it happened. He blamed me and turned my life upside down. I went through hell. As long as your son has support from the people he cares about the most he will be fine. I can tell you though when my brother was shot in front of me he died instantly. At that time I thought Cheryls suicide was a choice she herself had made. My brother didnt have a choice. So explain to your son that his friend made that choice. No one chooses suicide with out first thinking about it for a long time.