Problem while removing an item from list

I need to remove an item from a  list which derives from BusinessListBase. When i use remove method to remove that item from the list, actually it gets moved to the DeletedList. But the actual problem is in the deletedlist, each item lost its RecordUpdateLoginId. why is it so? I need this propertys value so that i could update it in the table. Please see commented line "this.DeletedList"

public void Remove(string categoryName, string runby)
{

Category newCategory = Category.GetCategory(categoryName);
newCategory.RecordUpdateLoginId = runby;
Remove(newCategory);

//this.DeletedList

}