Overview
- Karol-Chik admitted to passing the rock that killed Bartell to co-defendant Joseph Koenig.
- The plea deal includes charges of second-degree murder and attempted first-degree murder.
- Karol-Chik will testify against Koenig, the only defendant still facing trial.
- Victim Alexa Bartell was one of seven drivers targeted in the rock-throwing spree.
- Co-defendant Zachary Kwak also pleaded guilty and faces 20-32 years in prison.