The suspect is described a black male between 18-25 years old, five-feet six-inches tall and around 140 pounds.
Investigators hope a composite sketch will help lead to an arrest in the murder of a muffler store owner earlier this month.
Michael Kozel, 57, was working inside his Independent Muffler Shop when two men entered the store and pretended to be customers before pulling out a gun. He was shot in the back during the course of the robbery. An employee was not hurt in the incident.
Police released a sketch of one of the suspects, described a black male between 18-25 years old, five-feet six-inches tall and around 140 pounds. He was last seen wearing a light blue jacket, black stocking cap and dark denim pants.
The second suspect is described as a black male between 18-25 years old, 6 feet all and 160 pounds.
Crime Stoppers is offering a $1,000 cash reward for information that leads to arrests in the case (1-800-535-STOP).
Kozel operate the shop at 5654 S. Western Avenue for more than 20 years.