In the Jean de LaCroix free play game after you break out of jail the first person you meet is this Spanish officer.
After you kill him you can continue the story. But when you come back to Havana later, there he is. You can not speak or interact with him. I have not tried killing him again to see if he comes back or not.
After you kill him you can continue the story. But when you come back to Havana later, there he is. You can not speak or interact with him. I have not tried killing him again to see if he comes back or not.