Who is the most evil person you have ever met in your entire life?

I swear i was thinking about this just this morning. A childhood friend. He was on my mind today and i dont know why. He decapitated his girlfriend. When we were younger his family and another family had this ongoing fued. He and the youngest son didnt like each other but i was friends with them both.They did the i'm telling my brother spiel and in the process , They both lost 2 brothers each during this fued. He's in prison now.