Man...That must suck. I'll be more than happy to put him in my thoughts. My grandfather passed away when I was only six years old of sudden cardiac death. I didn't cry but I sure as heck missed him. So...You're not the only one who's grandfather had died.
I will pray for him, even though I don't pray, and don't totally see what good will come from it besides the comfort you will hopefully feel. I am soo sorry for your loss.
I'll pray for him, even though I hardly care about other's losses. But both of my grandfathers died before I was born. And my grandmother died from cancer, so I know how you must feel.