12 celebrities you forgot had passed away – #3 died at his peak (With Photos)

9. John Ritter

Ritter, who starred in TV shows such as Three’s Company and 8 Simple Rules, tragically passed away on September 11, 2003, at the age of 54. The actor actually became ill while filming 8 Simple Rules. Ritter began to suffer from severe chest pains as well as vomiting. After being taken to hospital, Ritter’s condition was unfortunately misdiagnosed and doctors began to treat him for a heart attack. It was later discovered that Ritter had an aortic dissection; however, the star passed away during surgery to fix this dissection.