A 26-year-old man accused of murdering a 16-year-old girl in a Perry County ATV accident has pleaded guilty to transporting a minor with the intent to engage in criminal sexual activity, according to court documents filed with the US District Court, Eastern District of Kentucky Southern Division.On Saturday, Feb. 28, 16-year-old Emilynn Clark died in an ATV (All-Terrain Vehicle) accident when another teen who was driving lost control of the vehi…