Investigators say their efforts to conceal the hit-and-run make the case much more serious.
"When you have people who are aggressively trying to elude responsibility, elude law enforcement, destroy evidence, and in this case, trying to conceal the death of an individual, it's a little difficult to be overly sympathetic," said Tom Dart, Cook County Sheriff.
The arrests come as a relief to Michael Cranston's relatives. They gathered at the gas station where he was last seen alive and collected a collage of sympathy cards.
"I understand it most likely was a mistake, and he was scared, and he didn't want to 'fess up, or deal with consequences, but he's doing the right thing now," said Kathryn Gidney, victim's niece.
Marcus Hampton's father talked to his son earlier in the day, urging him to do the right thing and turn himself in.
"I'd like to give my condolence to the family. Our family, a Christian family, we never knew what happened. We're sorry and our heart goes out to you," said father Randall White.
Hampton is currently on parole for armed robbery and possession of a stolen car. He said nothing to reporters before surrendering to sheriff's officers. He and the other suspects are scheduled to appear in bond court Thursday morning.