On June 14, 2007, Kimberly Vaughn and her three children were shot to death inside the family SUV while the family from Oswego, Illinois, was reportedly on a trip to a waterpark. Christopher Vaughn, often referenced in coverage as Stewart Vaughn, says he pulled over to check a car issue and that Kimberly began shooting, but investigators found inconsistencies in his account. He was arrested, charged, and ultimately convicted; prosecutors argued he planned to abandon suburban life and move to Canada, citing communications about wilderness living and large expenditures at strip clubs shortly before the killings.

The defense suggested Kimberly’s prescription medications could have produced severe side effects and that she might have been the shooter, a possibility the prosecution rejected at trial. Vaughn was sentenced to four consecutive life terms. Since the conviction, wrongful conviction advocates and some forensic experts have called for reexamination, arguing certain evidence and investigative choices merit fresh review.