John Francis Dunsworth (April 12, 1946 – October 16, 2017) was a Canadian actor, best known for playing the alcoholic trailer park supervisor Jim Lahey on the comedy series Trailer Park Boys, despite not drinking for the part. As well as the mysterious reporter Dave Teagues on the supernatural drama series Haven and also Shattered City: The Halifax Explosion, a CBC film about the 1917 Halifax Explosion. He had extensive experience in regional theater.