Kacper Klepacki, best known as Dein here (but he had few smaller accounts) on BK passed away on 27th Oct 2017 at age of 37.

He had heartache and numbness in hands after workout. His dad drove him into ED but they doctors did not find anything suspicious. He collapsed by his car as he was leaving hospital grounds. He was hospitalized but died shortly after with head damage, large hearth stroke and cardiac arrest reported.

He is survived by his wife.
http://www.rdn.pl/news/parkingu-szpitalnym-zmarl-mlody-mezczyzna