Police are looking for the person who shot four people in the River North neighborhood early Sunday morning.
Initially, police said one man was shot in the head and killed in the 500 block of West Erie.
That 20-year-old man is in critical condition this morning.
Three other men were injured.
Witnesses say the victims were inside a car when someone in a passing vehicle shouted gang slogans at them , and opened fire.
Those men are among 25 people injured and three others killed in shootings over the weekend.