[4] Later, Stefán Karl was invited by Magnús Scheving, an Icelandic gymnast, to portray one of the characters in the second LazyTown play.

[citation needed] Magnús created the plays due to his concerns about Iceland's younger generation lacking sufficient physical exercise.

[6] Stefán Karl was the nephew of actor and comedian Magnús Ólafsson and cousin of former footballer Hörður Magnússon.

[9][10][11][12] A GoFundMe campaign was subsequently created by LazyTown head writer Mark Valenti to cover his living costs when he became too ill to work.

[14][15] He clarified on his GoFundMe campaign that while his metastases had been removed after successful liver surgery in June 2017, he still had the disease and had refused further adjuvant therapy.

"[22][23] His manager, Cheryl Edison, announced that the Stefán Karl Academy & Center for the Performing Arts would be launched in Switzerland in 2019 as a memorial to his career.