I also did not know him but am very sorry for your loss.

A poem I like to think of when I think of death:
For what is it to die but to stand naked in the wind and to melt into the sun?
And what is it to cease breathing, but to free the breath from its restless tides, that it may rise and expand and seek God unencumbered?
Only when you drink from the river of silence shall you indeed sing.
And when you have reached the mountain top, then you shall begin to climb.
And when the earth shall claim your limbs, then shall you truly dance. (Khalil Gibran)

I believe that love is the only thing that lasts after death and in time you will find tho he is not walking with you on earth anymore he is always with you.
After my brother passed it was raw pain for a long while then I came to know that the love we share transcends death.