Jeremy Herbstritt

Jeremy Herbstritt, 27, a graduate student from Western Pennsylvania, had undergraduate degrees in biochemistry and molecular biology from Penn State. He was doing graduate work in civil engineering and hoped to begin a career in environmental work.

He was known as the kind of student who went out of his way to make others feel at ease. He was an avid long-distance runner whose parents had gone to Boston on Monday to watch his sister run in the Boston Marathon as part of a charity group, Centre Volunteers in Medicine.

Picture from the Herbstritt Family, via Associated Press