A former researcher at the Massachusetts Institute of Technology was sentenced Tuesday to 35 years in prison for the killing of a Yale University graduate student found shot outside his car on a Connecticut street. Qinxuan Pan, 33, who pleaded guilty to murder in February, apologized during a hearing in a New Haven courtroom packed with family and friends of the victim, Kevin Jiang. “I feel sorry for what my actions caused and for everyone affected,” Pan said.