Police want to talk to the person in the video, who they say is connected to the attack that killed 58-year-old Ronald Rockett. The attack occurred at about 3:14 p.m. in the 1200-block of South Christiana Avenue, police said.
Rockett was found with several cuts to his neck in the vestibule of a building and was pronounced dead at the scene, police said.
Anyone who recognizes the person is asked to call Area Central detectives at 312-747-8380.