Merge User Function?

RT 3.4.5

When a user is autocreated from an email and then later tries to login
through the web the email address cannot be added since it already
exists for a different user. Is there a way to merge the two user
accounts to show that they are one in the same? Since tickets may be
associated to the autocreated account I can’t really just deactivate
that account and move it to the appropriate user.