The Beaver Countian was the only news organization in the courtroom today, as Andrew Ryan Marvich, 24 of Chippewa, pleaded guilty to charges stemming from a July 21, 2011 incident which resulted in the death of 18-year-old Carlee Houghtelin. Marvich admitted to driving drunk with a blood-alcohol-content of .12, and to speeding down the highway…