Police responded to a call of shots fired around 7:10 a.m. in the 4900 block of South Marshfield Avenue and found three people with gunshot wounds, police said.
Two people were pronounced dead at the scene, police said. The Cook County medical examiner's office has not yet identified them.
A 28-year-old man suffered gunshot wounds to the chest, shoulder and back, police said.
He was taken to the University of Chicago Medical Center where he was listed in critical condition, police said.
No one is in custody as Area One detectives investigate.