Otherwise, we're just repeating from folklore - that often is correct and insightful (and useful for signposts when researching) - but also often wrong in details (or just plain wrong too).

Indulging my pedantic side then, I quickly looked this up in <Delphner> - the best open source archive for newspaper articles (though restricted to mostly Dutch papers):

<HELSINKI — Paul Petrovich Keres , the Russian chess grandmaster, has died in Helsinki at the age of 59. With him passed away one of the most famous chess players in history. Keres suffered a second heart attack in Helsinki . On May 31, Keres arrived in Helsinki after a month's stay in Canada, where he won the tournament for the open Canadian championship . A day later he would return by boat to his hometown of Tallin. An hour before departure, Paul Keres suffered a heart attack. Although his condition improved in the following days, a second heart attack proved fatal. Prof. Dr. Max Euwe, the president of the World Chess Federation, who played against Keres more than twenty times , including at the end of 1939 and the beginning of 1940 in a match of fourteen games that Keres won 7.5-6.5, regards Keres as the ambassador of the chess game. 'Paul Keres was a wonderful man. A .gentleman in every respect. He was extremely sporty and never sought his own gain. A man with inexhaustible patience. He practically agreed to everything as long as it wasn't too crazy. Keres ' death is a tremendous loss for chess>

https://resolver.kb.nl/resolve?urn=...

https://www.chessable.com/discussio...

"In 1975, Paul Keres (1916-1975) died of a heart attack in Helsinki, Finland, while returning home to Estonia from the World Class Championship in Vancouver, B.C. He had just won the event despite a doctor’s orders not to play in the event due to the stress and his high blood pressure. His airplane had taken off from Helsinki to Tallinn when Keres had his heart attack. The aircraft turned around and landed back at Helsinki and Keres was rushed to the hospital and died."

Happy New Year.

<Vancouver 1975 was the name chosen for the first big class tournament in Canada. We figured that we would label the tournament the same way it would be in chess books. That has led to various chess authors inventing names for the event, such as Canadian Open, to the chagrin of those involved with the 1975 Canadian Open in Calgary.

Vancouver 1975 took place from May 17 to 25, ten rounds in nine days. Heading the five grandmasters was Paul Keres, frequently labeled the best player never to have won the World Championship. He was a contender from 1938 (when the tied for first in the AVRO tournament) to 1965 (when he lost a Candidates' match to Boris Spassky.

Keres had been retained by John Prentice, chess lover and Canada's FIDE representative, to give seminars to Canada's top players. That's what happened in Montreal and Toronto, but Vancouver already had a tournament lined up. Would he like to play? Against doctors' orders, Keres took part in Vancouver 1975. He placidly went through the event without apparent strain, racking up 8.5 points, 1.5 more than Elod Macskasy, John Watson, and GM Gyozo Forintos. Keres even made duplicate copies of his scoresheets, perhaps fearing for the permanence of the new-fangled no-carbon-required copies.>

Always good to have a first-hand account of events from the reliable Bill Wall. Those were different times, before people's heads operated by an electronic device.

Walter Browne was one of a kind. "King of the Swiss" played all sorts of games: https://vault.si.com/vault/1976/01/...

CGs does not have a player page for Frank Szarka.

Here's one of Mr. Wall's books: https://www.goodreads.com/book/show...

I was referring to this source:

<CHESS PLAYER DIRECTORY

This is a directory of the most eminent chess players in the database.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z>

A very thorough and account of his death is given above by <Olavi> and <stone free or die>.