Add the following code to your themes functions.php file to remove a user from your WordPress site.
//remove a user from WordPress by WP username add_action( 'init', 'ec_delete_user'); function ec_delete_user() { require_once( ABSPATH . 'wp-admin/includes/user.php' ); $username = 'ecenica'; if ( username_exists( $username ) ) { $user = get_user_by( 'login', $username ); $success = wp_delete_user( $user->ID ); wp_die('wp delete gave: <pre>"'.print_r($success).'"</pre>'); } }