Feeling with you, stranger friend!
Serious tip: don't traumatize your child by making it over the top traumatic and they'll be fine!
Your instinct is correct, kids have an amazing grasp on life and death.
I had and have the same topic with my back then three year old. I won't go into details but death is a topic for quite a while now.
Be open, be honest and don't shy away from translating it to his level: If he had a favorite toy that got destroyed it's an emotional connection he can make for example.
One important thing for me to point out though because it caught me as a shock: true empathy is impossible for a kid that age. Meaning: the chance is high that hell say something that will be completely out of the blue or shocking - expect it and don't be too harsh please, even when he'll manage to trigger something ❤️