In a 14-page memo, Kasper-Ansermet said Cambodian staff followed the instructions of his Cambodian counterpart, You Bunleng, only.
Chhouk Bandith was questioned by the provincial court last week but walked away without being held.
Duch said Wednesday that Pol Pot and Nuon Chea “monopolized” decisions on “policy, commerce, the economy and the military.”
At least 12 Cambodians were reported dead in Malaysia in 2011, nine of them housemaids and three of them factory workers.
Kasper-Ansermet’s resignation throws further doubt of moving forward with a group of additional prosecutions known as cases 003 and 004.
During testimony Tuesday, Duch admitted he was “not clear” on the policymaking of the regime.
Duch tells the UN-backed court that the regime had a policy to “arrest and kill” perceived enemies and spies.
Naranhkiri Tith said the leadership of Suu Kyi and Mandela could serve as a good example for Cambodians.
Rights groups and opposition party officials say the practice rarely meets with success and is an indictment of a failed court system.
Duch is scheduled to testify at the court on Monday in the atrocity crimes trial of Nuon Chea, Khieu Samphan and Ieng Sary.
Though Khmer antiquities are highly sought-after on the global stage, the country’s modern art remains relatively unknown.
Environmental activists say he was a major impediment to stopping illegal logging in the province.
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