David Alan Hornsby (born December 1, 1975) is an American actor and screenwriter. He is best known for a recurring role as defrocked priest Matthew "Rickety Cricket" Mara on the FX comedy series ''It's Always Sunny in Philadelphia'', for which he also writes and produces. Hornsby also had a regular role on the NBC comedy-crime series ''Good Girls'' (2018–2020). He is also the voice of Fanboy in the Nickelodeon animated TV series ''Fanboy & Chum Chum''.
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