My first rooster, Joel, declined quietly for a couple weeks, then had a seizure and died at 13 months. I found Martha dead under the roost, barely 2 years old. No sign of illness, or issues.fwiw I don't think we need look for nefarious causes or get suspicious about neighbours. Henry was very old and had fly strike. Fret is quite old and is not dead yet. Tull was young and barely into her stride, but I have had several birds die suddenly, apparently for no reason or of suspected heart failure, some even on the verge of adulthood when one would assume they should be as healthy as they'd ever be (most recently Zoar, Xmoor's twin from last year).
One of the first was shortly before I had the first inspection from the APHA inspector, many years ago now, and I spoke with him about it. He said it is surprisingly common. It is often put down to what we used to call being highly strung; affected birds don't handle stress well at all.
It stinks, but it happens.
