Red leg in frogs is deadly, usually occurs during winter. Its BD virus usually transfers from bullfrogs.Tail fins look rather red, was that normal for your koi? Water conditions? Did you test the water? Any new fish, plants?
Sorry for the loss, and hopefully we can help you get to the cause. My first thought is either infection or ammonia spike based on the red look of the tails, but I’m no expert on koi.
I am in nw NJ, also have a pond 12+ yrs. My koi were same age, over 12in. 6 koi + 16 goldfish. 4 koi died 2wks ago, all goldfish are fine. The pond is approx. 750gal. 28in deep, Was cleaning out leaves when I found the 2 largest koi on the bottom. Over the summer, they had eaten a large waterlilly but nothing else unusual. Do not know why, after these years , they died.4 other fish in pond about 5 months old fine. Very sad.
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