Prosecutors said Lathem and his co-defendant, Andrew Warren, had made a suicidal pact to kill each other, but instead killed Cornell. And whatever the motive, they said, the physical evidence pointed to Lathem having an active role in the slaying. He also sent a video to his parents in the days after the stabbing saying, “I killed him,” and that it was not an accident.
Former Northwestern professor sentenced to 53 years for slaying of boyfriend
