Use stream of consciousness to answer the following. Stefán Karl Stefánsson (/ ˈstɛfən ˈstɛfənsən /; Icelandic: ( ˈstɛːfaun ˈkhartl̥ ˈstɛːfaunsɔn); 10 July 1975 -- 21 August 2018 ) was an Icelandic actor and singer, best known for playing antagonist Robbie Rotten on the children's television series LazyTown.

Answer this question based on the passage: when did the guy who played robbie rotten die?
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The important part for answering this question is: Stefán Karl Stefánsson (/ ˈstɛfən ˈstɛfənsən /; Icelandic: ( ˈstɛːfaun ˈkhartl̥ ˈstɛːfaunsɔn); 10 July 1975 -- 21 August 2018 ) was an Icelandic actor and singer, best known for playing antagonist Robbie Rotten on the children's television series LazyTown. Final answer: 21 August 2018.
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