The Saturday Night Live star has agreed to appear in the show's Christmas special, TV Line reports.
He is expected to play the choir director at Greendale.
However, further details of his storyline have not yet been released.
As well as working on Saturday Night Live, Killam has appeared in shows including How I Met Your Mother, Scrubs and MADtv.
Community airs on Thursdays at 8/7c on NBC.
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