Index: app/views/issues/index.api.rsb
===================================================================
--- app/views/issues/index.api.rsb	(revision 17570)
+++ app/views/issues/index.api.rsb	(working copy)
@@ -22,6 +22,8 @@
 
       render_api_custom_values issue.visible_custom_field_values, api
 
+      api.last_updated_by(:id => issue.last_updated_by.id, :name => issue.last_updated_by.name) unless issue.last_updated_by.nil?
+
       api.created_on issue.created_on
       api.updated_on issue.updated_on
       api.closed_on  issue.closed_on