The (Somerset) Daily American reports 21-year-old Tyler Kerlin, of Jenners, pleaded guilty Monday to theft by unlawful taking, a third-degree felony.
Police say Kerlin and his friend took the tractor from Boswell Lions Community Park in the township on July 29.
While driving on a path meant for all-terrain vehicles, Kerlin hit a tree and his friend was thrown from the tractor, then run over by a rear wheel and a brush hog attachment.
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Kerlin will be sentenced June 21.
His 19-year-old friend will be arraigned April 25 on theft-related charges.