DURHAM, N.C. (AP) — Authorities have charged a suspect in the slaying of the University of North Carolina student president with the January killing of a Duke University graduate student. A warrant filed Thursday charges 17-year-old Lawrence Alvin Lovette Jr. with first-degree murder in the death of Abhijit Mahato. The 29-year-old computational mechanics doctoral student was found shot to death inside his apartment in January. Authorities have charged both Lovette and Demario James Atwater with first-degree murder in the death of Eve Carson. The 22-year-old was found last week lying on a street about a mile from campus.