Codeignitor Query

I have a query that works but I need to add to it and I am not sure how.  I need to pull two different fields.

Right now it looks like this

<?php
  SELECT
                CASE
                    WHEN o.business_type_id = 1 THEN o.first_name
                    WHEN o.business_type_id = 4 THEN o.legal_name 
                    ELSE o.business_name
                END 

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But I need to pull the First_Name and the Last_Name

Like this:

<?php
  SELECT
                ### Line 1 ###
                CASE
                    WHEN o.business_type_id = 1[b] THEN o.first_name AND .o.last_name[/b]
                    WHEN o.business_type_id = 4 THEN o.legal_name 
                    ELSE o.business_name
                END 

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