John Harkins (September 7, 1932 - March 5, 1999) was an American actor who played Lieutenant Costa, Garth Blackwood, Mr. Strak, and Horace Gladstone on Dark Shadows. Harkins had various roles in many television shows and movies. He played the minister in the famous Chuckles the Clown episode of the Mary Tyler Moore show. He also portrayed Fred Fenner, a recurring character on the series Doc during its first season.
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