A Singapore Airlines flight bound for San Francisco ended in tragedy for one man on Saturday.
The man, whose name is not known at the moment, died on board Singapore Airlines flight SQ2 which was on its way to the US city from Singapore via Hong Kong.
Singapore Airlines said the man, who was holding a US passport, was found unconscious one-and-a-half hours before the flight landed in San Francisco.
Three passengers, believed to be from the medical field, answered the call for help from the air crew and tried to provide medical assistance.
They tried reviving him but their attempts were unsuccessful.
The cause of death could not be confirmed at the moment.
Singapore Airlines said it will provide any form of assistance needed by the man's family