hook_node_delete($node)Respond to node deletion.
This hook is invoked from node_delete_multiple() after the node has been removed from the node table in the database, after the type-specific hook_delete() has been invoked, and before field_attach_delete() is called.
$node The node that is being deleted.
modules/node/node.api.php, line 390
<?php
function hook_node_delete($node) {
db_delete('mytable')
->condition('nid', $node->nid)
->execute();
}
?>