I got a death threat for 10 years

I was in elementary school and my dad worked at a restaurant, he had a fight with a coworker who came to our house and threatened to kill my dad and my sister and me because my dad got in a fight with him. I'm terrified of him because I was a kid, and it's not like I knew what was happening. He would show up to our house a few times a year and I would freak out every time. I've never told anyone, not even my dad. I'm a grown adult now and I still feel so terrified every time I think about him.