WASHINGTON (Reuters) - A young diplomat killed in Afghanistan will be remembered at memorial service on Tuesday at the suburban Chicago high school she attended, and where just a few months ago she spoke with students about her experiences in the US Foreign Service. Anne Smedinghoff, 25, was killed along with four other Americans in a car bomb blast Saturday as their convoy traveled in Zabul province to deliver textbooks to school children. A 2005 graduate of Fenwick High School, a private Catholic school in Oak Park, Illinois, Smedinghoff had spoken with students about her experiences in the US Foreign Service in December, Associate Principal Richard Borsch said.