Matt Moore – More than 60 previous winners of the Right Livelihood award, also known as the "alternative Nobel" prize, on Friday called for a complete investigation into the poisoning death of an Indonesian human rights activist.

Munir, who went by a single a name, fell ill and died September 7 aboard a Garuda flight bound for Amsterdam, after vomiting repeatedly. The activist, who won the prize in 2000 for his efforts to improve human rights in Indonesia, was later found to have been fatally poisoned with arsenic, according to an autopsy by Dutch investigators.

"We call on the Indonesian government under its leader, President Susilo Bambang Yudhoyono, to conduct a thorough investigation ... and make every effort to bring the perpetrators to justice as quickly as possible," said Jakob von Uexkull, the founder and chairman of the Stockholm-based foundation behind the award.

Munir's death was the second time a Livelihood laureate has been killed. In 1995, Ken Saro-Wiwa, 54, and eight others from his tribe were executed by a Nigerian military tribunal, after they were convicted of orchestrating the mob killings of four tribal chiefs.

But activists have contended they were framed to silence their outspoken opposition to the late dictator Gen. Sani Abacha's regime and Nigeria's oil industry, which Saro-Wiwa accused of polluting the 500,000-strong Ogoni people's land in the Niger Delta.

The Right Livelihood award was founded in 1980 by von Uexkull, a former member of the European Parliament and a stamp dealer who sold his collection to fund a program to recognize work that he believed was ignored by the prestigious Nobel Prizes. Recipients of the annual award share a 2 million kroner (US$268,100) cash prize.

This year's winners included celebrity activist Bianca Jagger, along with two Indian religious scholars, an Argentine scientist and a Russian human rights group.