Albert Einstein died on April 18, 1955, at the age of 76 due to internal bleeding caused by the rupture of an abdominal aortic aneurysm (AAA), a condition where the main blood vessel in the abdomen bursts

. He had previously undergone surgery in 1948 to reinforce the aneurysm but refused further surgery when it ruptured, stating, "I want to go when I want. It is tasteless to prolong life artificially. I have done my share; it is time to go. I will do it elegantly"

. Einstein was hospitalized at Princeton Hospital during his final days but declined surgical intervention. He continued working until near the end and passed away peacefully early on April 18, after mumbling some last words in German that were not understood by the nurse present

. Following his death, the pathologist Thomas Stoltz Harvey removed Einstein's brain without the family's permission, hoping future neuroscience could reveal the source of his genius. Einstein's body was cremated, and his ashes were scattered at an undisclosed location, in accordance with his wishes

. In summary, Einstein died from a ruptured abdominal aortic aneurysm, having refused surgery to prolong his life, and passed away peacefully in hospital