# John Ritter's death cause still unknown

> John Ritter would still be alive if more was known about his cause of death, says pal.
- Title: John Ritter's death cause still unknown · FemaleFirst
- Summary: John Ritter would still be alive if more was known about his cause of death, says pal. John Ritter's brother survived aortic dissection surgery after his…
- Keywords: john ritter, aortic dissection, thoracic aortic aneurysm, john ritter foundation, amy yasbeck, three's company, richard kline, FemaleFirst
- Source: FemaleFirst — https://femalefirst.co.uk/celebrity/john-ritter-still-known-cause-death-says-pal-richard-kline-1453182.html
- Published: 2026-11-04T16:30:13+00:00
- Read time: 1 min
- Topics: john ritter, aortic dissection, thoracic aortic aneurysm, john ritter foundation, amy yasbeck, three's company, richard kline, entertainment, culture
## John Ritter's death
John Ritter died from aortic dissection on September 11, 2003, at age 54.
## Richard Kline's view
Richard Kline thinks John Ritter would still be alive if more was known about his cause of death.
## John Ritter Foundation
The John Ritter Foundation for Aortic Health was set up in his memory to teach about the condition.
## Amy Yasbeck's account
Amy Yasbeck said John died of undiagnosed thoracic aortic dissection in 2003.

> John died in 2003 of an undiagnosed, and then misdiagnosed in the emergency room, thoracic aortic dissection
## John's brother's survival
John's brother Tom survived aortic surgery after being diagnosed with an aneurysm.

> Four years on from when John passed away, Tom’s showed an aneurysm in the ascending portion, which is right where John’s was
## Key takeaway

John Ritter's brother survived aortic dissection surgery after his death due to undiagnosed condition.