Stand next to the interior side of the door, and open the door. Locate the flange, a curved metal plate at the base of the stem of the door knob. Wedge the blade of a butter knife between the flange and the door. Pry the flange away from the door. Locate two Phillips-head screws, one on each side of the shaft of the door knob.
Unscrew the two screws that hold the latch assembly together. Remove the screws. Pull the interior and exterior knobs and flanges away from the door to remove them. Locate the face plate for the latch bolt on the edge of the door.
Unscrew the screws that hold the face plate on the edge of the door. Grasp the latch bolt, then pull it horizontally to finish removing the latch.