A former Napa schoolteacher was arrested Wednesday in Thailand in the slaying of 6-year-old beauty queen JonBenet Ramsey -- a surprise breakthrough in a lurid, decade-old murder mystery that had cast a cloud of suspicion over her parents.

During a press conference Thursday afternoon, Napa Valley Unified School District officials provided details of the detainment of John Mark Karr, the man arrested in the 1996 death of Jon Benet Ramsey.