Index: wp-admin/network/users.php
===================================================================
--- wp-admin/network/users.php	(revision 28419)
+++ wp-admin/network/users.php	(working copy)
@@ -77,6 +77,9 @@
 		}
 	}
 
+    /** This action is documented in wp-admin/users.php */
+    do_action( 'delete_user_form', $current_user );
+
 	submit_button( __('Confirm Deletion'), 'delete' );
 	?>
 	</form>
Index: wp-admin/users.php
===================================================================
--- wp-admin/users.php	(revision 28419)
+++ wp-admin/users.php	(working copy)
@@ -244,6 +244,17 @@
 		<?php echo '<label for="delete_option1">' . __( 'Attribute all content to:' ) . '</label> ';
 		wp_dropdown_users( array( 'name' => 'reassign_user', 'exclude' => array_diff( $userids, array($current_user->ID) ) ) ); ?></li>
 	</ul></fieldset>
+
+<?php
+    /**
+     * Fires at the end of the delete users form prior to the confirm button
+     *
+     * @param WP_User $current_user WP_User object for the user being deleted.
+     *
+     * @since 4.0.0
+     */
+    do_action( 'delete_user_form', $current_user );
+?>
 	<input type="hidden" name="action" value="dodelete" />
 	<?php submit_button( __('Confirm Deletion'), 'secondary' ); ?>
 <?php else : ?>