c# - Using ArcObjects to stop items from being deleted from Table of Contents?

I am using ArcObjects in a C# addin with ArcGIS 10.3.1 for Desktop.

I'm trying to stop a user from removing certain layers from the Table of contents. I have my listeners setup for IActiveViewEvents_ItemDeletedEventHandler but want to know how/what to capture the layer that is removed? Can this be done, or can I only inform the user that they removed something?

Answer

Thanks to @KirkKuykendall I was able to implement this solution.

 public void On_TOCItemDeleted(object Item)
 {
     var DeletedLayer = Item as ILayer;

     if (DeletedLayer == null)
       throw new Exception("Not iLayer file");


     var grouplyr = GetGroupByName(ArcMap.Document.FocusMap.Layers, groupname);


      grouplyr.Add(DeletedLayer);

     ArcMap.Document.UpdateContents();
     ArcMap.Document.ActiveView.Refresh();
}

The 'object' passed to the method is the layer being deleted, so I can just re-add to the TOC.