Lamont Grant, 34, was charged with first-degree murder, attempted first-degree murder and aggravated battery with discharge of a firearm, police said.
Police said he was identified as the man who shot two people in the 2900 block of South State Street, the same block where Grant lives, on Saturday about 6:15 p.m.
Ralph Mcneal, 54, was pronounced dead after the shooting at 7:10 p.m. at Stroger Hospital. A 26-year-old man suffered a graze wound, authorities said.
Mcneal, nicknamed "Cubby," was described by family as a man who loved to dance and make his friends laugh.
Brooks, of the New Beginnings Church at 6620 S. King Drive, said Grant's family, some of whom are members of the church, called him Tuesday night and told him Grant wanted to turn himself in.
"He wanted make sure he turned himself in, in a faith way," Brooks said.
Brooks, who said he didn't know Grant until Tuesday night, posted a photo of the two of them on Twitter along with a tweet that said, "Turning a brother into the police for shooting and killing two people we just prayed I gave him the plan of salvation he accepted."
Grant and Brooks first met at a "neutral" place according to Brooks. "He was real distraught about the situation," Brooks said.
"We talked about forgiveness. We talked about repentance. We talked about making mistakes" as well as "dealing with consequences," Brooks said.
Grant is scheduled to appear in bond court on Wednesday.