My Co worker died T-T

I didn't know him very well, but tomorrow I will be attending his funeral.
Should I be ashamed of myself for not feeling bad about not knowing him better?
I only talked to him a handful of times, "whats up?" " "how are you?" and "what are ya up to?".
He was always making jokes, and he was a nice guy.
I'll pray for his family. I can only imagen what they are going through right now.
So if you are reading this keep him in your thoughts, even for just a moment.