RALEIGH, N.C. — Claire Elise Mercer, the 22-year-old computer science engineer convicted in connection with last year's Carolina Future Technology Expo disaster, was executed Thursday at Appalachian Detention Complex, two weeks after she was sentenced to death.
Mercer, who declined to appeal her conviction, was put to death by firing squad after the court completed its final procedural reviews. She had consistently acknowledged making unauthorized changes to the Autonomous Emergency Coordination System, but maintained that she intended to expose flaws in the system and force a postponement of its public demonstration—not cause deaths.
Investigators traced the changes to Mercer's authenticated developer account and concluded that modifications to the emergency-routing and infrastructure-coordination software contributed to the catastrophic failure at the October 18, 2025, expo. The malfunction locked emergency exits, misdirected evacuation routes and disrupted autonomous shuttle operations, killing dozens and injuring many others.
Mercer's execution marks the end of her legal case, but not the broader AECS proceedings. Her former roommate, collaborator and co-defendant, Natalie Grace Whitmore, remains on death row and is pursuing her appeals.
Mercer's final hours included a last medical examination, meetings with her parents and Whitmore, and a final interview with this newspaper. Witnesses said she appeared increasingly emotional before the execution, repeatedly expressing remorse while maintaining that she had never anticipated the scale of the disaster.
Tomorrow:
The Final Hours of Claire Elise Mercer
An exclusive account of Mercer's final day, including her final interview, her last meetings with her family and Whitmore, and details of the final hours leading up to her execution.