Before deleting a node agent, the node agent must be stopped. You can also delete a node agent if it has never been started, or never successfully able to contact the Domain Administration Server (that is, if it is still unbound).
For a complete description of the command syntax, see the online help for the command.
asadmin delete-node-agent nodeagent1
where nodeagent1 is your node agent.
When deleting a node agent, you must also delete its configuration from the Domain Administration Server using either the Admin Console or the asadmin delete-node-agent-config command.