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Yes, very sad news indeed. Just checked my log, and we had 23 RTTY contacts, the last in 2017.
I think I had an email from him since then, but I seem to recall it was early in 2018.
Like others, when I first got into RTTY contesting, he was one of the first to encourage me to do more, especially as I was a good mult.
The DXLab group only mentioned that he had become SK, nothing more, but I am sure more info will become known soon enough.
Such a shame, he will be missed.
73 de Phil GU0SUP