With advances in transcatheter treatment options, percutaneous device closure of ventricular septal defects has become a safe and practical alternative to surgical repair. While outcomes have been excellent, late complete heart bock has been documented during follow up of pediatric patients. We report a case of late complete heart block complicating percutaneous device closure of a ventricular septal defect in a 37-year-old female requiring permanent pacemaker insertion. The patient underwent transcatheter closure of an atrial and ventricular septal defect in the context of treated pulmonary hypertension and significant intracardiac shunting. Seven months after the procedure, the patient was admitted with presyncope, with electrocardiographic monitoring confirming complete heart block. While previously only reported in the pediatric literature, awareness of the possibility of complete heart block should be considered during the late follow up of adult patients.