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In the NOS News newsreader Sascha de Boer states that Willem Breuker died of lung cancer.
Just for the record, this is what happened:
WB was diagnosed with cirrhosis of the liver. In 2007 he received a successful liver transplant. He started performing again in 2008 for the Kollektief’s 35th anniversary, touring The Netherlands with Dutch guests. Everything seemed to be all right. The new liver was working like a charm.
In 2010 his lungs were giving him problems, and in April he was diagnosed with asbestos cancer. WB died on 23 July 2010