Which of Ernest Hemingway's wives died of acute shock?

Pauline Marie Pfeiffer (July 22, 1895 – October 1, 1951) was an American journalist, and the second wife of writer Ernest Hemingway.

Hemingway married Pauline in May 1927, and they went to Le Grau-du-Roi to honeymoon. Pauline's family was wealthy and Catholic; before the marriage Hemingway converted to Catholicism. By the end of the year Pauline, who was pregnant, wanted to move back to America. They left Paris in March 1928.

They had two sons, Patrick and Gregory. In 1937, on a trip to Spain, Hemingway began an affair with Martha Gellhorn. Pfeiffer and he were divorced on November 4, 1940, and he married Gellhorn three weeks later.

Pfeiffer spent the rest of her life in Key West, with frequent visits to California, until her death on October 1, 1951 at age 56. Her death was attributed to an acute state of shock related to her son Gregory's arrest and a subsequent phone call from Ernest. Gregory, who had experienced gender identity issues for most of his life, had been arrested as a male caught entering the women's restroom in a movie theater. Years later, after he had become a medical doctor, Gregory interpreted his mother's autopsy report as indicating that Pauline had died due to a pheochromocytoma tumor on one of her adrenal glands. His theory was that the phone call from Ernest had caused the tumor to secrete excessive adrenaline, and then stop, the resultant change in blood pressure causing her to go into the acute shock that caused her death.