Kenneth Bae, 44, who was born in South Korea but is an American citizen, has been held since November when he visited the North Korean city of Rason.
He was tried in the country's Surpreme Court on charges of plotting to overthrow the government but the exact nature of his alleged crime has not been revealed.
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Muhiddin Mire cut the throat of a stranger at an east London tube station "in revenge for the fight against IS", a court heard.
The significant development came after a forensic re-examination of a palm print left on a getaway vehicle.
Carla Lane was once one of the UK's highest paid screenwriters.