Investigators said the two had a romantic relationship that recently ended. Police found her body Thursday in Schaeffer's off-campus apartment.
According to a police affidavit, Schaeffer told investigators he had been drinking but was not intoxicated, and had recently stopped taking Zoloft. Police say they recovered the knife used in the attack. Wagner declined comment on a possible motive.
Silverstein was an anthropology major and was active in groups such as Amnesty International and Free the Children. She was taking Arabic and planned to study in Morocco next year.
"She was the biggest pacifist around and the sweetest, most gentle soul you'd ever encounter in your life," said her uncle, Matthew Black, 42, of Tinton Falls, N.J.. "Her one great hope was that she would just make the world a better place."
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Information from: Pittsburgh Post-Gazette, http://www.post-gazette.com
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