IOWA CITY, Iowa (AP) — Authorities in Illinois say an Iowa man charged in 1990s serial killings “does not appear to have been involved” in the unsolved 1992 slaying of a college student. The Illinois State Police says that Clark Perry Baldwin is not a suspect in the death of 21-year-old Tammy Zywicki.

Its statement appeared to rule out what had seemed to be a promising lead in the case of Zywicki, who was abducted after experiencing car troubles on Interstate 80 near La Salle, Illinois in 1992. Police arrested Baldwin, a former truck driver, at his home in Waterloo, Iowa on Wednesday. He’s charged in the deaths of three woman from the early 1990s.