The highly anticipated premiere of 'Dateline' NBC's season 33 will take place tonight, focusing on the mysterious disappearance and tragic death of Katelyn Markham, an art student from Fairfield, Ohio. The episode will detail the twists and turns of her case, including the decade-long mourning of her fiancée, who was ultimately charged with her murder. Viewers can find out how to watch the premiere for free, as it promises to explore the chilling details surrounding Markham's case and the significant impact it had on those involved. Stay tuned for a deep dive into what happened to Katelyn Markham and insights into the latest developments in her story.