How to add data to an existing empty table cell

How to add data to an existing empty table cell

I have code that does a $.get(urlstring, function(data){    

which builds a table.  Then I add data from another $.get from another table to add to the div:

$('#sampleDiv .testClass').each(function(index){ 

for each match to the key.

This works great for the display on the page, but I have added the tablesorter library to the table, and all of the columns will sort, except for the columns that have been added from the second .get. I'm assuming it's because they are in the div, and not in the table?

How do I add new values to the already existing blank cells in the table by their matching index so I can sort them? 

Thank you!