How to Pull a property from JSON and make it an autocomplete input box

I am trying to make an autocomplete input list box in Jquery.  What I am a little lost on is that I am pointing to a JSON file from a RESTful url, the JSON file that is produced has a list and each record has more than one property.  Let's say I am trying to use employee last names and the department Id as a filter.  How could I filter and grab only the employee last names?  The JSON includes the first name, the employeeid, the last name and the department id for each record.
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VBBRettAuthor Commented:
Would this work pulling an array in JSON?
Check the example carefully, you will JSON array
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VBBRettAuthor Commented:
OK, taking a look and will report back.
VBBRettAuthor Commented:
Is there a way to store the records into an array so that I could use the autocomplete Jquery function?
you mean you loose and go another direction ?
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