Redirect After Delete User in Backend

You could also do this,

function mod_redirect_subscriber_delete($user_id) {
  $user  = get_user_by('id', $user_id);
  $role   = $user->roles[0];
  if ($role == 'subscriber') {
    add_action("deleted_user", function(){
        wp_redirect( admin_url('/index.php') );
        exit;
    });
  }
}
add_action("delete_user", "mod_redirect_subscriber_delete");

Anonymous functions (closures), available in PHP 5.3+.

Benefits:

• No need to remove the initial hook on delete_user
• No need to re-run wp_delete_user()
• You still get to hook onto deleted_user because we retain the user’s role within the function, hence we place our closure in the if(conditional) statement.