The video focuses on the area near East 13 Street and Hamilton Avenue, just east of the Galleria downtown.
No arrests have been made in the past month, and this is the first significant piece of information made available to the public. Sherman, 53, was leaving her attorney's office nearby just before she was murdered.
Anyone with information regarding the person in the video is asked to call the Homicide Unit at 216-623-5464. A reward of $25,000 is being offered by friends, family members and Crime Stoppers.