You can always delete it directly from the database. For version 4.4 there is a table called "portalpage" which stores the dashboard entries. You'll also need to remove the corrosponding gadgets from the "portelconfiguration" table. Just lineup the ID column from the "portalpage" table to the PORTALPAGE column from the "portelconfiguration" table. The dashboards don't go away until you restart JIRA.
Hope this helps.
Or you could just use the delete dashboard functionality that has been added to JIRA 4.4 without having to touch the database, with all the risks that brings - see http://confluence.atlassian.com/display/JIRA/Managing+Shared+Dashboards
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