Afternoon, I have a sublist on a suitelet, when the user deletes a row and saves, I'm only seeing the remaining rows posted back. Is there a reference to the deleted row in the parameters postback anywhere?

Nope. If this was a User Event Script on a record, you would have access to context.newRecord and context.oldRecord. If your are creating your sublist in a Suitelet, you would have to keep track of the deleted rows yourself in a client script and pass them to the suitelet