Lawrence County District Attorney Josh Lamancusa says that he will seek the death penalty against 43 year old Keith Burley, Jr of Edingburg. He was arrested Tuesday in Youngstown following the stabbing death of eight-year-old Mark Mason at a home in Union Township. At least two other juveniles witnessed the fatal stabbing. Burley is being held in the Mahoning County Jail and is awaiting an extradition hearing today.