Proof was two albums into a promising solo career when Mario Ethridge shot and killed him during an argument over a game of billiards in 2006. He was a childhood friend of Eminem, member of D12, and author of unimpeachable rhymes. If he were alive today, he would be 42 and still slaughtering 90% of the current rapper population on the mic.

Click through the gallery to revisit 10 of his best moments. RIP Proof.