The cause of death of William “Paul Bearer” Moody was revealed yesterday by Moody’s son, Michael. Moody died from a heart attack that was caused by supraventricular tachycardia (SVT), or a rapid heart rate. SVT is a condition that is treatable and is not life-threatening, but it appears that Moody ignored the symptoms of SVT until it was too late.
Source: ProWrestling.net