It was August 2011. The weekend of the annual Sacred Heart Festival in Fairfield, Ohio.
The festival was right up the street from Katelyn Markham’s townhouse.
So when Katelyn was nowhere to be found on Sunday, her fiancé called 911.
He told the operator he was concerned, what with the questionable people who might have been at the fair.
Fairfield police arrived at Katelyn’s townhouse and found no signs of forced entry or a struggle.
Family and friends joined the search for the charismatic young art student.
It would take nearly two years to find Katelyn’s remains, and more than a decade to catch her killer.
To see the full story, watch “The Butterfly” on Peacock now.
You can also watch on the NBC app or listen to it on our podcast.
After you’ve finished the episode, watch Katelyn’s family and friends reflect on her life.
Plus, hear more from Katelyn’s art teacher, Dave Geiser, about her passion for art and creativity.
You can also listen to this week’s episode of Talking Dateline with Andrea Canning and Josh Mankiewicz in which they take you behind the scenes of the episode.