Even U.S. President Donald Trump didn't acknowledge the pair.
America's Central Intelligence Agency has reportedly concluded that the crown prince ordered the killing - a claim strongly denied by the Saudis. "But Argentine judicial authorities have turned back that effort as they take steps toward investigating the crown prince's connection with alleged war crimes by the Saudi-led coalition in Yemen and torture by Saudi officials". "We might [later], but we had none", President Trump told the press pool.
Local officials in a Washington neighborhood have voted to rename a street outside Saudi Arabia's embassy in honor of slain Saudi journalist Jamal Khashoggi.
From the signing of a new North American trade agreement to a very chummy meeting between Russian President Vladimir Putin and Saudi Prince Mohammed bin Salman, the eyes of the world are on Buenos Aires, Argentina.More news: Closure of GM's Oshawa plant reveals rapid changes in auto industry
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Trump has had no discussion yet with the crown prince but would not rule one out.
In the video, the French President can clearly be heard saying "I am worried" after the Crown Prince tells him not to be concerned.
Several leaders including French President Emmanuel Macron and British Prime Minister Theresa May said they would raise Khashoggi's killing during talks with the crown prince on the sidelines of the summit.
White House spokesperson Sarah Sanders insists the reason for the cancellation was the situation with Ukraine, but said the probe into possible collusion between the Trump presidential campaign and Russian Federation was damaging ties between the two countries.
In fact, Trump even cancelled a formal sit-down with Putin over Moscow's seizure of Ukrainian vessels.
One leader who nearly didn't make the photo was outgoing Mexican President Enrique Pena Nieto, who ran in at the last minute to a round of applause from the others, waving his hand in apology.