In this case report, a previously asymptomatic 11-year-old boy presented with sudden palpitations and syncope. He eventually went into cardiac arrest and was successfully resuscitated. The ECG showed pre-excited atrial fibrillation degenerating into pulseless ventricular tachycardia. The patient was found to have Wolff-Parkinson-White syndrome (WPW) with an accessory pathway between right atrium and ventricle which was successfully ablated. Sudden cardiac death (SCD) is rare in WPW, however, early diagnosis is essential for eliminating the risk of SCD.