JQuery :: Remove Table Row That Was Added

I'm adding a table row like the following:

var newID = 'proj_assoc_' + $pnum;
var $newTr = $("<tr></tr>");
$newTr.attr( 'id', newID );
$newTr.html( $output );
$('#ti_associated_project_numbers_table').append($newTr);

($output is html defined above that) Works fine for adding it to the table. My code for removing a row does not work. Here's that code:

var $row = $('#proj_assoc_' + $pnum);
if ( $row.length>0 ) {
$row.remove();
}