Forum:First kill in One Piece ?

You know, it's commonly known that the first person to kill in One piece is Lucky Roo, when he killed one

of Higuma's goons holding a gun on Shanks. But, on the very first one piece page, we see 2 marines holding blades at the public execution of Gol D. Roger. So it can-it be assumed that they are the first killer of One piece ?