It was not known Saturday evening whether the man's death was a result of the crash, which killed two women and injured 21 people.
Relatives of both women filed wrongful death lawsuits against Wells. Police ticketed Wells for negligent driving.
The truck driver whose semi smashed into a CTA station in April died. Sixty-four-year-old Donald Wells of Metamora, Michigan died either late Friday or early Saturday, according to the Cook County Medical Examiner's office.