DOLTON, Ill. (WLS) -- A suspect was shot Wednesday night during an attempted armed robbery at an auto parts store in south suburban Dolton. A customer said the suspect ran at him with a weapon, so he opened fire.The 20-year-old man with a gun walked into the Advance Auto Parts store in the 800-block of East 147th Street around 8 p.m. and tried to rob the store, police said.He ran out of the store and toward a customer, who told police the suspect had a gun. The customer pulled out his own weapon and shot the suspect at least once.One of the front doors was shattered during the shooting, covering the ground with shards of glass. A handgun appeared to have fallen on the sidewalk.The 20-year-old was transported to St. Bernard Hospital in critical condition where he died. The Cook County Medical Examiner's Office identified him as Jonathan Agins of Dolton.Police said the customer has a concealed-carry permit. The shooting remains under investigation.