One of my best buds just died...how to handle the mental pain?

Yesterday, my friend was on his bycicle, and he got hit from a truck that came from over the hill he was at the bottom at...I was with him...and I called 911, they came here ASAP and worked on him for about 30 minutes... but he died. He died right in front of my eyes, and I don't know what to do. I feel so... show more Yesterday, my friend was on his bycicle, and he got hit from a truck that came from over the hill he was at the bottom at...I was with him...and I called 911, they came here ASAP and worked on him for about 30 minutes... but he died. He died right in front of my eyes, and I don't know what to do. I feel so horrible, and can't get it out of my head. Any advice, please?
Update: www.chippewa.com the photo for today and the story is right under it.
Update 2: http://www.chippewa.com/articles/2007/06/13/news/893x.txt

Here's the story if you want to read it.
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