Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 6971)
+++ /CKEditor/trunk/CHANGES.html	(revision 6972)
@@ -79,4 +79,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/7637">#7637</a> : Cursor position problematic after inserting page break in some cases.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/188">#188</a> : [IE] Objects selection were making the toolbar inactive on some situations.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/5314">#5314</a> : The aria-selected attribute was not been removed when rich combo box list items were deselected.</li>
 		<li>Updated the following language files:<ul>
 			<li><a href="http://dev.ckeditor.com/ticket/7834">#7834</a> : Dutch;</li>
Index: /CKEditor/trunk/_source/plugins/listblock/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/listblock/plugin.js	(revision 6971)
+++ /CKEditor/trunk/_source/plugins/listblock/plugin.js	(revision 6972)
@@ -203,6 +203,12 @@
 					unmark : function( value )
 					{
-						this.element.getDocument().getById( this._.items[ value ] ).removeClass( 'cke_selected' );
-						this.onUnmark && this.onUnmark( this._.items[ value ] );
+						var doc = this.element.getDocument(),
+							itemId = this._.items[ value ],
+							item = doc.getById( itemId );
+
+						item.removeClass( 'cke_selected' );
+						doc.getById( itemId + '_option' ).removeAttribute( 'aria-selected' );
+
+						this.onUnmark && this.onUnmark( item );
 					},
 
@@ -214,5 +220,8 @@
 						for ( var value in items )
 						{
-							doc.getById( items[ value ] ).removeClass( 'cke_selected' );
+							var itemId = items[ value ];
+
+							doc.getById( itemId ).removeClass( 'cke_selected' );
+							doc.getById( itemId + '_option' ).removeAttribute( 'aria-selected' );
 						}