Sally Katona-King, 68, died after being pushed down by a thief who police say had just stolen another commuter's iPhone.
The suspect is described as African American, between 17 and 25 years old, 5'11" to 6'4", weighing 170 to 220 pounds.
CTA commuters were greeted Thursday by police officers passing out the sketch.
"We are hoping that people will see this composite on the news, they'll see it on the Internet, however they can see it. We have police officers going up and down the street, going to the businesses hoping they will post them in their windows," said Commander Gary Yamashiroya, Chicago Police Department.
So far it appears that surveillance video did not capture an image of the robber. Police are calling on area businesses to check their tape. While there are various cameras, including a police camera, close to the Fullerton stop, there is only one at the station located at the entrance.
Alderman Tom Tunney, 44th Ward, and Alderman Vy Daley, 43rd Ward, say they were promised multiple cameras at the Fullerton and Belmont stations as part of the Brown Line renovation project.
"This issue has been brought time and time again. We were promised cameras for the stations as part of the build-out," said Tunney.
"We did talk about the Brown Line expansion many times. We have to go back on that once again. Clearly we have a camera facing the turnstile, but we have nothing upstairs and we really should have them on the platforms," said Ald. Vi Daley, 43th Ward.
The CTA says as of last spring all stations were equipped with at least one high-definition camera. In a statement released Thursday, the agency said, "all stations are scheduled to have multiple cameras, including on platforms later this year." Even then, police say it doesn't guarantee a suspect will be caught.
For months the CTA has been warning riders about a rise in smart phone thefts. Even older model phones can fetch hundreds of dollars on the Internet. And with many loaded with banking and investment apps which require personal information, the mobile phones a popular target for identity thieves.
"If you lose your smart phone, treat it like you lost your wallet. And that means be prepared ahead of time," said Daniel Bulley, Identity Theft Resource Center. "If you keep important things in there, you need to lock it down."
Anyone with information should call Area 3 Police at 312-744-8261.