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In page Lucille Ball:

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On Wednesday, April 26, while still in the hospital, Ball awoke with severe back pain, then lost consciousness and died at 5:47 a.m. PDT.[2][1][3] Doctors determined that she had succumbed to a ruptured abdominal aortic aneurysm. They also learned the area of the aorta operated on the week prior had no bearing on the abdominal tear.[citation needed]