Condolences, Robbie.

You've definately come to the right site for empathy and interest.

Sounds like something rather catastrophic may have occurred in your pond.

First, a clarification: Do you see ANY fish life in the pond whatsoever? Rises? Small fish by shoreline? It sounded from your post that you might not. My pond is also in TN near Nashville [where are you?], just in last 2 weeks have temps come up enough for a lot of spontaneous activity to be apparent.

If you don't see any evidence of fish life, then some really toxic event may have taken place, very low oxygen levels during summer, a sudden change in pH,etc. Is there a lot of decaying vegetation in the pond, perhaps from the heavy woods nearby? It is possible that some of the occasional fish kills you mention in the past were sentinal events, and that loss of your aerator was the coupe de grace.......