Jakarta - The Indonesian Supreme Court sentenced a former senior official from Garuda Indonesia airlines to one year in jail for aiding in the murder of a prominent human rights campaigner who was poisoned on a flight to Amsterdam four years ago, state-run media said Wednesday.

The Supreme Court overturned the lower court's acquittal of Rohainil Aini, the former secretary to the chief pilot of national carrier Garuda Indonesia, linked to the murder of Munir Said Thalib.

The court sentenced Rohainil to one year in prison, saying that she had been proven guilty of falsifying an assignment letter enabling an off-duty Garuda pilot, Pollycarpus Budi Priyanto, to travel on Munir's flight.

In February last year, the Central Jakarta District Court acquitted Rohainil of all charges on the grounds that she had signed the letter on orders from her superior.

But Supreme Court Judge Artidjo Alkotsar said that Rohainil was only authorized to change the flight schedule but not to change the flight crew.

In January last year, the Supreme Court sentenced Pollycarpus, who was proven to be linked to Indonesia's intelligence agency BIN, to 20 years in jail for lacing Munir's orange juice with arsenic. Former Garuda chief Indra Setiawan was jailed for one year for his role in the murder.

Many observers were surprised at Rohainil's jail sentence, particularly after the South Jakarta District Court last month cleared Muchdi Purwoprandjono, a former deputy chief of the National Intelligence Agency, of any wrongdoing in connection with the murder of Munir.

Munir, who died aged 38, was a prominent critic of human rights abuses by the Indonesian military and provided legal counsel to victims of state violence during former dictator Suharto's 32-year rule. He died of arsenic poisoning while traveling to the Netherlands on a commercial flight aboard the state carrier Garuda in September 2004. (dpa)