Who is the song HOW COME by D12 about?

The song "How Come" by D12 primarily addresses the feelings of loss and betrayal experienced by the group members, particularly focusing on the late rapper Proof, who was a key figure in D12. The lyrics reflect on themes of mortality, the struggles of fame, and the impact of losing close friends. The song conveys a sense of vulnerability and sorrow as the members grApple with their emotions and the complexities of their relationships. Overall, it serves as a poignant tribute to friendship and the pain of separation.