That man, who was identified as Yiran Fan, 30, a University Chicago doctoral student, was pronounced dead at the scene, according to Chicago police.
Approximately 30 minutes later, Nightengale entered an apartment building in the 4900 block of South East End Avenue. He fired shots at a woman, who was serving as a security guard at the building. The victim, Aisha Nevell, 46, was taken to the University of Chicago Medical Center, where she was pronounced dead.
Another woman, 77, was inside the building retrieving her mail when she was hit by gunfire. She is in critical condition at the University of Chicago Medical Center, police said.
A 22-year-old man was critically injured after he was shot in the face early Tuesday while riding in the backseat of a silver sedan on Lake Shore Drive, according to Chicago police.