John collapsed on the set while filming "8 Simple Rules." John began feeling very ill on the set and began sweating, vomiting, and complaining of chest pains.

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Just six days shy of his 55th birthday, John Ritter—the Emmy-award winning sitcom star—wasn’t feeling quite right.

Ritter, best known for playing the rakish Jack Tripper on the 70s/80s television classic “Three’s Company,” was rehearsing lines on the set of his latest show, “8 Simple Rules for Dating My Teenage Daughter.” On the program, Ritter played the stern-but-loving father to a pair of teenage girls.

One minute your daughter is wearing bunny slippers and demanding bedtime stories.

The next, she's wearing a midriff-baring t-shirt and demanding the car keys.8 Simple Rules for Dating My Teenage Daughter takes us shriek by shriek thorugh the process of raising teenage girls, including braces (the most expensive metal on earth), the telephone (seemingly wired to her nervous system), and, of course, dating (Rule #2: Keep your hands and eyes off my daughter's body, or I will remove them).

Instead of going to vital organs like the brain, liver and kidneys, this blood is trapped within the aorta’s walls.

And as more blood gets trapped, the tear itself gets bigger, worsening the problem.John Ritter died unexpectedly in September 2003 after suffering an aortic dissection.Sadly, John's death took place on what was also his daughter's fifth birthday.The walls of that tube are made up of three layers: an inner layer, a middle layer, and an outer layer.When the inner layer rips, blood can get redirected into the tear itself, creating a pocket in between the inner layer and the middle layer.The family source reveals John Ritter would have been very accepting as his only wishes for his daughter was her lifelong happiness.