Not sure what is special about "dicebreaker.com" but here's an official announcement from the Catan site https://www.catan.com/catan-fans/news/we-mourn-passing-klaus... as well as a memorial on the Spiel des Jahres site https://www.spiel-des-jahres.de/trauer-um-klaus-teuber/ though that one is in German.
Not sure what is special about "dicebreaker.com" but here's an official announcement from the Catan site https://www.catan.com/catan-fans/news/we-mourn-passing-klaus... as well as a memorial on the Spiel des Jahres site https://www.spiel-des-jahres.de/trauer-um-klaus-teuber/ though that one is in German.