Stefán Karl announced in October 2016 that he had been diagnosed with bile duct cancer; a GoFundMe campaign was subsequently created by LazyTown head writer Mark Valenti to pay his living costs when he became too ill to work.
Stefánsson a anunțat în octombrie 2016 că a fost diagnosticat cu cancer biliar; o campanie GoFundMe a fost creată ulterior de scriitorul LazyTown, Mark Valenti, pentru a-și plăti costurile de trai atunci când a devenit prea bolnav să muncească .