Gedrick is set to guest star as a murderer named Craig Wendell, who is sentenced to death row after being put away by Hank Griffin (Russell Hornsby), reports TVLine.
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However, he begins to convince Hank that his crime was in self-defence against two "monsters".
Gedrick's previous television appearances include Dexter, Luck and Necessary Roughness.
Luck was cancelled by HBO after one season this year.
Watch a clip of Grimm below:
