How to Add to Fetched Records?

How to Add to Fetched Records?

I have a function that checks to see if an issue is overdue. If it finds any, it sends an email to a fetched set of people who indicated they want such emails. I would like to add the person to whom the issue was assigned to this list, even if s/he did not so designate. I tried 

fetchedUsers:ui.add(Users[Name == violation.Assigned_To]);

but I get an error saying I can only try this in [ON-LOAD].