CHICAGO (AP) — U.S. Secretary of State John Kerry stopped in Chicago today to visit the parents of the young U.S. diplomat killed in Afghanistan. Anne Smedinghoff was killed while delivering textbooks in southern Afghanistan earlier this month.

Kerry made the detour on his way back from Japan, the final leg of a 10-day overseas tour. The trip started with tragedy when he learned of the 25-year-old Smedinghoff’s death. She grew up in the Chicago suburb of River Forest.

Kerry contacted Smedinghoff’s parents, Tom and Mary Beth, from Andrews Air Force Base after she died. On Monday, he flew in directly to see them and Smedinghoff’s three siblings.

An FBI investigation is in its preliminary stages.

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