The American military was 99 per cent certain that Mohammed Emwazi, known as Jihadi John, had been killed in a drone strike in Syria.
Downing Street and UK Ministry of Defence sources were marginally less certain in their response to the reports of his death than US sources, but added there was a "high degree of certainty that he has been killed".
"However, it would have been far better for us all if he had been held to account in a court of law. These events only underline the necessity of accelerating international efforts, under the auspices of the UN, to bring an end to the Syrian conflict as part of a comprehensive regional settlement," he was quoted as saying by The Independent.
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Corbyn in the past has come under fire for his statements.
He faced criticism for saying it was a "tragedy" that Osama bin Laden was killed by the United States rather than being put on trial.
He had made the remarks shortly after the special forces raid on the al-Qaeda chief's Pakistan compound in 2011.