In each incident, someone was approached by a man armed with a black handgun who demanded their property and fled on foot, police said.
The robberies happened:
• About 7 a.m. Apr. 2 in the 6800 block of South Bishop Street;
• About 8:35 a.m. Apr. 8 in the 6800 Block of South Laflin Street; and
• About 5:30 a.m. Apr. 15 in the 6700 Block of South Ashland Street.
The suspect was described as a Black male, between 18 and 30-years-old, about 5-foot-7 to 6-foot-2, wearing a black hoodie and red skull cap, authorities said.
Anyone with information is asked to contact Area One detectives at 312-747-8380.