function bp_activity_post_type_unpublish( $post_id = 0, $post = null ) {

	if ( ! is_a( $post, 'WP_Post' ) ) {
		return;
	}

	// Get the post type tracking args.
	$activity_post_object = bp_activity_get_post_type_tracking_args( $post->post_type );

	if ( empty( $activity_post_object->action_id ) ) {
		return;
	}

	if ( empty( $post_id ) ) {
		$post_id = $post->ID;
	}

	$delete_activity_args = array(
		'item_id'           => get_current_blog_id(),
		'secondary_item_id' => $post_id,
		'component'         => $activity_post_object->component_id,
		'type'              => $activity_post_object->action_id,
		'user_id'           => false,
	);

	$deleted = bp_activity_delete_by_item_id( $delete_activity_args );

	/**
	 * Fires after the unpublishing for the custom post type.
	 *
	 * @since 2.2.0
	 *
	 * @param array   $delete_activity_args Array of arguments for activity deletion.
	 * @param WP_Post $post                 Post object.
	 * @param bool    $activity             Whether or not the activity was successfully deleted.
	 */
	do_action( 'bp_activity_post_type_unpublished', $delete_activity_args, $post, $deleted );

	return $deleted;
}