I know how you feel
Every morning when I woke up I said "Good morning my little Uno bug! How are you buddy?" And he would run out of his igloo and jump and turn and squeak and run and be all crazy and I would watch him! The morning after he passed, I said "Good morning my little Uno bug! How are y-" then I remembered. His cage was empty, he was never going to squeak again. Never going to go crazy, never going to jump and turn and run. I broke down and cried. But then my other hammies came out of their igloos, and one of Uno's babies, who I was keeping just because they look just alike, squeaked.
I'm so sorry for your loss. Enjoy your other hamster, they are born to be enjoyed!