While we were at the station partaking in the first class of Module 2 of the essentials class we were dispatched to assist Medic 11 for a cardiac arrest in Lausanne township on North Stagecoach Road. Within 2 minutes of dispatch 1955 was responding with a truck full of officers. We arrived on scene within 5 minutes of dispatch to find CPR being performed by a bystander. The fire company personnel took over CPR and applied the AED but to no avail. Medic 11 arrived on scene and contacted the medical command doctor who advised us to stop CPR. The county official also assisted Medic 11 and fire district 19 on scene.