Where an expert witness did not have the background related to cardiology, testimony that the victim died due to heart condition was not properly admitted.The 7th U.S. Circuit Court of Appeals reversed a decision by U.S. District Judge Staci M. Yandle, Southern District of Illinois.When Chelsea Weekley was approximately 5 months old, she was dropped and suffered a skull fracture. As the fracture expanded over time, a cyst formed on her skull. At 17, Weekley was hit in the head and suffered a loss of consciousness, blurred …