$current = get_settings('active_plugins');
array_splice($current, array_search( $_GET['plugin'], $current), 1 ); // Array-fu!
update_option('active_plugins', $current);
do_action('deactivate_' . trim( $_GET['plugin'] ));
$current = get_settings('active_plugins');
array_splice($current, array_search( $_GET['plugin'], $current), 1 ); // Array-fu!
update_option('active_plugins', $current);
do_action('deactivate_' . trim( $_GET['plugin'] ));