Deleted user, now how to delete posts?

[SEOvB]

I'm not so sure its possible now that you've deleted the user. You need to delete the posts before deleting the user.

One way to try is to register a new user with that username and run the maintenance tools for rebuilding information and see if they get reassociated with his account by chance, then remove the posts and then the user.

It should only remove his posts, and no one elses. So if he started a thread, it should remain while his first post is gone.