Prickly relations between the U.S. and Islamabad are becoming even thornier because of one issue: the case of Shakil Afridi, the Pakistani doctor who helped the CIA find Osama bin Laden in 2011. Afridi is seen as a hero by many Americans, but that didn't deter Pakistan from jailing him for alleged militant ties. The U.S. Congress is withholding $33 million in aid to Pakistan until the doctor is freed. But Afridi's lawyer fears this tactic will antagonize Islamabad. He urgently wants Afridi freed, warning that the doctor is at severe risk of being killed by fellow prisoners.