Jean Ann Lingenfelter, a white female teenager from McHenry County, Illinois, died on May 27, 1970, at the age of 17 or 18. She was laid to rest at Oakridge-Glen Oak Cemetery in Hillside, Cook County, Illinois. Public records and memorial sources identify her as a murder victim, though specific details about the circumstances of her death are limited in publicly available sources.
While direct information about the events surrounding Jean Ann Lingenfelter’s death is sparse, her case
has been linked in some sources to the crimes of Mark Alan Smith, a convicted serial killer active in Illinois and Arkansas during the late 1960s and early 1970s. Smith, a white male born in 1949, was convicted of multiple murders and sentenced to over 500 years in prison. He was known to have lived in McHenry County, Illinois, during the time of Jean Ann Lingenfelter’s death.
Smith’s confirmed victims include women from the McHenry area, and his criminal activity during that period involved abduction, sexual assault, and murder. However, Jean Ann Lingenfelter’s name does not appear in the list of officially confirmed victims in the most detailed public accounts of Smith’s crimes. It is possible that her death remains unsolved or unprosecuted in connection with Smith or any other suspect.
No public records indicate that an arrest was made specifically in connection with the murder of Jean Ann Lingenfelter. If her case was investigated as part of the broader inquiry into Smith’s crimes, those details have not been widely reported or confirmed in accessible sources. Her death remains a tragic entry in the historical record of violent crimes in McHenry County during that era.
