Illinois State Police, in coordination with the Federal Bureau of Investigation, disclosed a new person of interest in the decades‑old kidnapping and murder of Tammy Zywicki, a Grinnell College student who vanished in August 1992. The announcement, made on August 23, marks the 34th anniversary of Zywicki’s disappearance and signals a renewed investigative push using modern forensic tools.
Who is the new person of interest?
Authorities identified Theresa “Teri” Belenske, whose maiden name was Theresa Vega, as a person of interest. While not labeled a suspect, investigators believe Belenske may have had a connection to an unidentified semi‑truck driver who has long been central to the case. Belenske was known to hitchhike and could have traveled with the unknown driver before Zywicki’s death. She was 32 years old in 1992 and died in 2014 at age 54.
What investigators are seeking
Police are asking the public for any information about Belenske’s activities and acquaintances from the late 1980s through the mid‑1990s. They note that she had ties to several California communities, including Oceanside, Vista, Pomona, San Bernardino and Fontana. Any leads regarding her movements, contacts, or possible travel with a truck driver during that period could prove critical.
Background on the case
On August 23, 1992, 20‑year‑old Tammy Zywicki left Evanston, Illinois, for Grinnell College in Iowa. She was last seen driving a white 1985 Pontiac T1000 on Interstate 80 in LaSalle County, Illinois, between 3:10 p.m. and 4:00 p.m. An Illinois State Police trooper later found the vehicle abandoned on the highway. The car was towed the following day after Zywicki’s mother reported her daughter’s failure to arrive for class.
On September 1, 1992, Zywicki’s body was discovered along Interstate 44 in rural Lawrence County, Missouri, between Joplin and Springfield. An autopsy determined she had been stabbed to death. Witnesses reported a semi‑truck near her disabled vehicle at the time of her disappearance. The driver was described as a white male, 35‑40 years old, over six feet tall, with dark, bushy hair.
Modern investigative techniques
Investigators are reviewing roughly 200 pieces of evidence and re‑testing items with contemporary DNA technology. The renewed focus on Belenske reflects a broader strategy of re‑examining old leads through the lens of today’s forensic capabilities.
Reward and how to help
The FBI is offering a reward of up to $50,000 for information that leads to the identification of the person or persons responsible for Zywicki’s murder. Anyone with knowledge about Belenske, her associates, or the circumstances surrounding Zywicki’s disappearance is urged to submit a tip through the Illinois State Police tip portal or call 1‑800‑CALL‑FBI. Anonymous tips are accepted.
Community response
The announcement has prompted renewed interest from Zywicki’s family, former classmates, and true‑crime enthusiasts across the Midwest. While the case remains unsolved, the involvement of a new person of interest offers a measure of hope that justice may finally be served for the Zywicki family.
Original reporting: KCCI Des Moines — read the source article.
