How to transfer the ownership of the dbo schema in SQL Server 2012

Question

I've accidentally given a user the ownership of the db_owner schema (using the check box in the UI as below) and now I cannot:

1. Transfer ownership to another user
2. Drop the user from DB (though I can delete login in the SQL Server)

I tried The database principal owns a schema in the database, and cannot be dropped.

ALTER AUTHORIZATION ON SCHEMA::db_owner TO dbo

And while it completed successfully, the user still has ownership, and it's greyed out so I can't seem to do it in the UI either.

Found a solution:

In addition to Arron's answer, I realised that I'd run the above command in wrong DB (facepalm!). Once the DB had been corrected both the above SQL and the answer below worked.

Answer 1

Slightly different approach would be to give the schema back to the original owner/schema, instead of to dbo:

ALTER AUTHORIZATION ON SCHEMA::db_owner TO db_owner;