Alternate Source
Mikołaj Klimek — Polish voice actor died on July 12. Rest in peace…
On July 12, 2020, Mikołaj Klimek, the Polish voice actor of King Sombra and a few other MLP characters, died unexpectedly at only 48 years old, after passing out on the street. The immediate cause of his death is yet unknown, though a heart attack or a stroke are the most probable hypotheses for now.
I didn't get to meet him, but those who did say that he was a nice man and (allegedly) a little bit of a brony himself.
Rest in peace, Mr. Klimek!
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