Index: watcher.module
===================================================================
--- watcher.module	(revision 71)
+++ watcher.module	(working copy)
@@ -503,6 +503,13 @@
 }
 
 /**
+ * Implementation of hook_nodeapi(), op: delete
+ */
+function _watcher_hook_nodeapi_delete(&$node, $a3, $a4) {
+  db_query('DELETE FROM {watcher_nodes} WHERE nid=%d', $node->nid);
+}
+
+/**
  * Implementation of hook_comment()
  */
 function watcher_comment($comment, $op) {