Hire's my take on it.
Raditz: Face it Vegeta! Your not the prince you wher! You don't deserve to be an elite warrior!
Vegeta: *gets angrier and ANGRIER* NO MATTER HOW MUCH STRONGER YOU GET RADITZ! I WILL NOT LOOSE TO A LOW RANK WARRIOR LIKE YOU!!!!!!!!!!
Something happens to Vegeta, he is involved in a blue flame, and his blast tarns more powerful, and it kills him, everyone is left in shock, to not see Raditz, but Vegeta, as a super sayion blue, but he tarns back and collapses in Bulma's arms, Ranch looks around for her father, but he is no where to be sean, because, he's dead