O'FALLON, Ill. - A 51-year-old O’Fallon, Ill. man pleaded guilty Tuesday, June 9, 2026, in St. Clair County Court to involuntary manslaughter and obstructing justice in connection with the 2023 death of 31-year-old Allison Hartmire of O’Fallon, according to the O’Fallon Police Department.David S. Shovlin entered a guilty plea on June 9, 2026, for his role in Hartmire’s death on Oct. 23, 2023, police said.The charges were involuntary manslaughter, a Class 3 felony, and obs...