How to put a marker in the begnnig and in the end of the simulation plot?

Something like this:

r=[0 0 0];

for t= 0:0.1:20

      B1 = randi (6,1);
      if B1==1
          rnew=r+[1 0 0];
      elseif B1==2
              rnew=r+[-1 0 0];
      elseif B1==3
          rnew=r+[0 1 0];
       elseif B1==4
          rnew=r+[0 -1 0];
      elseif B1==5
          rnew=r+[0 0 1];
      else 
          rnew=r+[0 0 -1];

      end

      hold on;

      %start point Blue asterix
     plot3([0 0],[0 0],[0 0], 'Marker','*', 'LineStyle','none', 'MarkerFaceColor',[1 0 0], 'MarkerSize',10);
      plot3([r(1) rnew(1)],[r(2) rnew(2)], [r(3) rnew(3)]);
      drawnow ;
      %UPDATE the new position
      r=rnew;
  end

% endpoint Red circle
 plot3([r(1) rnew(1)],[r(2) rnew(2)], [r(3) rnew(3)],'Marker','o','LineStyle','none','MarkerFaceColor',[1 0 0],'MarkerSize',10);