The accused terrorist who said he was tortured into making a false connection between al Qaeda and Iraq has died in a Libyan prison, human rights monitors said Tuesday. Ibn al-Shaykh al-Libi’s allegation that Iraqi agents trained al Qaeda operatives in the use of chemical and biological weapons was “pivotal” to the Bush administration’s case for the 2003 invasion of Iraq, said Stacy Sullivan, a counterterrorism adviser for the U.S.-based Human Rights Watch. “He’s a fairly significant figure in the counterterrorism world, and his testimony I would say provided the linchpin for the invasion of Iraq,” she said.