In 2008, Darusman was called by Lynn Pascoe, an Under-Secretary-General of the United Nations, to participate in the United Nations inquiry into the assassination of former Pakistani prime minister Benazir Bhutto. He accepted, and the committee spent nine months investigating the incident through 2009. In June 2010, he was appointed to a three-person panel to write the Report of the Secretary-General's Panel of Experts on Accountability in Sri Lanka, which dealt with alleged war crimes during the Sri Lankan Civil War. The report, which found evidence of numerous war crimes and condemned both the Sri Lankan government and its Lessons Learnt and Reconciliation Commission, was ill-received in Sri Lanka, leading Darusman to be burned in effigy and refused entry to the island nation.