Case overview
On November 18, 1987, Keith Dardeen, his wife Elaine, their three-year-old son Peter, and their newborn daughter Casey were found murdered in their home in Ina, Illinois. The case remains unsolved despite multiple suspect theories, forensic review, and decades of investigation into one of the most brutal family homicides in Illinois history.
The discovery
Keith Dardeen failed to report for his shift at the Rend Lake water treatment plant on the morning of November 18, 1987. A coworker went to the family’s mobile home in rural Jefferson County and found the bodies of Elaine Dardeen and her two children inside. Keith’s body was discovered later that day along a dirt road approximately two and a half miles from the home, inside his pickup truck.
Elaine had been bludgeoned to death. The attack was severe enough that it induced labor, and she gave birth shortly before or during the assault. The newborn, a girl later named Casey, was also killed. Three-year-old Peter Dardeen was beaten to death. Keith had been shot multiple times, and his genitals had been mutilated. The weapon used in the beating was never recovered. No murder weapon linked to Keith’s shooting was found at the scene.
The timeline
Keith Dardeen was last seen alive on the evening of November 17, leaving work at approximately 5:00 p.m. He stopped at a convenience store on his way home, where he was captured on surveillance footage. Investigators believe the murders occurred sometime between that evening and the early morning hours of November 18.
The Dardeens had recently moved to Illinois from Texas. Keith had been working at the treatment plant for only a few weeks. The family had no known enemies, no history of conflict with neighbors, and no financial troubles that would suggest a clear motive. Elaine was nine months pregnant and had been preparing for the birth at home.
There were no signs of forced entry into the mobile home. Investigators found no evidence of theft or robbery. The brutality of the crime, combined with the lack of an apparent motive, led detectives to explore multiple theories, including the possibility that the killer knew the family or had targeted them specifically.
Investigative focus
One of the earliest persons of interest was Tommy Lynn Sells, a transient serial killer who confessed to multiple murders across the United States. Sells was in the area at the time of the Dardeen murders and later claimed responsibility for the crime in conversations with investigators and other inmates. His confessions were inconsistent, and he provided details that did not match the known evidence. Sells was executed in Texas in 2014 for the murder of a thirteen-year-old girl, but he was never charged in connection with the Dardeen case.
Another theory centered on a man seen near the Dardeen home shortly before the murders. Witnesses reported a man driving a light-colored van in the area on November 17. The individual was described as white, in his thirties, with a medium build. Investigators canvassed the area and followed up on multiple tips, but the man was never identified.
In 2008, the Illinois State Police reopened the case and reexamined forensic evidence using updated DNA technology. No new suspects were publicly named, and no arrests have been made. The case remains active, but the passage of time and the lack of physical evidence linking any individual to the crime have left investigators without a clear path forward.
Evidence and inconsistencies
Forensic analysis conducted at the time of the murders revealed no usable fingerprints or DNA evidence that could be definitively tied to a suspect. Blood evidence collected from the scene belonged to the victims. The weapon used to kill Elaine and the children was never found, and the type of object used has not been disclosed publicly.
The mutilation of Keith’s body has been a point of focus for investigators. Some have suggested it indicates a personal motive or a level of rage that goes beyond a random attack. Others believe the violence could be the work of an organized offender who intended to send a message or obscure the true motive.
Keith’s truck was found parked along a rural road with his body inside. There were no signs of a struggle in the vehicle, which led some to theorize that Keith may have been killed at a different location and moved. No secondary crime scene was ever located.
Theories and speculation
Multiple theories have emerged over the years. Some investigators believe the murders were the work of a drifter or transient who encountered the family by chance. The rural location and lack of witnesses made the area a low-risk environment for someone passing through.
Others have suggested the crime was premeditated and that the killer had knowledge of the family’s routine or vulnerabilities. The lack of forced entry supports the theory that Elaine may have known the person who arrived at the home, or that the individual gained entry through deception.
A third theory involves the possibility of mistaken identity or a case of being in the wrong place at the wrong time. The Dardeens had only recently moved to the area, and some have speculated that the killer may have been looking for someone else.
Where the case stands
The Dardeen family murders remain unsolved. The Illinois State Police continue to review the case periodically, and investigators have encouraged anyone with information to come forward. No arrests have been made, and no suspect has been publicly named since the case was reopened in 2008.
The case is considered cold, but advancements in forensic technology have kept the possibility of future developments open. Investigators have said they are willing to reexamine evidence if new leads emerge or if witness testimony surfaces that could provide clarity.
The Dardeen case is often cited in discussions of unsolved family homicides due to the extreme violence involved and the lack of a clear motive. It remains one of the most disturbing unsolved cases in Illinois history.
Where to look next
- Documentary: “Cold Case Files: The Dardeen Family Murders” (A&E)
- Book: “Tommy Lynn Sells: The Coast to Coast Killer” by Diane Fanning
- Podcast: “Crawlspace” (Crawlspace Media)
