He was originally from Prague, active in good old “Tacheles” in Berlin and finally worked as artist and founded a gallery in Hamburg St.Pauli. He was also an activist against gentrification and rising rents there.
His friend El Bocho wrote on Insta in July:
https://www.instagram.com/p/DavrfD_DsQR/
"Rest in peace, Alesh One. He was a wild one, a charmer, a bon vivant, an artist, a wonderful person, and my best friend. We got up to a lot of mischief, laughed a lot, and—over the past year and a half—cried a lot together, too.
He fought the way only Alesh One could, and I was amazed at just how disciplined this devil of a guy was.
Even when speaking, he always found the most inappropriate words—combined with his mischievous smile and sparkling eyes. I’m going to miss those moments so much.
You only meet a guy like that once in a lifetime, and I was incredibly lucky.
You loved art, and art loved you.
I learned so much from you, my best friend, and I thank you for those wonderful years."
Translated with DeepL.com (free version)
More about his background in German: Alesh One - Reeperbahn.com