wp_ajax_delete_tag()

function wp_ajax_delete_tag() {
	$tag_id = (int) $_POST['tag_ID'];
	check_ajax_referer( "delete-tag_$tag_id" );

	if ( ! current_user_can( 'delete_term', $tag_id ) ) {
		wp_die( -1 );
	}

	$taxonomy = !empty($_POST['taxonomy']) ? $_POST['taxonomy'] : 'post_tag';
	$tag = get_term( $tag_id, $taxonomy );
	if ( !$tag || is_wp_error( $tag ) )
		wp_die( 1 );

	if ( wp_delete_term($tag_id, $taxonomy))
		wp_die( 1 );
	else
		wp_die( 0 );
}