I'm so sorry about your friend. I'll say a prayer for his family and friends and for him.
I have a friend at work that was hit by a truck while she was on the back of a motorcycle, I walk with her at lunch, she is just able to walk again after 2 years.
Another work friend was killed on a dirtbike 15 months ago, hit the ditch, then the pavement with his head. He left behind 3 children and more family. It was so hard to hear and I still think of him everyday.
This stuff is never easy, always shocking, and so sad.
I'm so sorry!