Authorities investigating a 1984 homicide case in Portage County are looking for the anonymous author of a letter they say could help solve the case.

Twenty-year-old Janet Raasch was a student at the University of Wisconsin-Stevens Point when her body was found in some woods south of the city. Portage County sheriff's officials say they have never given up on solving the case.

Stevens Point Journal Media says sheriff's investigators initially were reluctant to say anything about the letter they received in 2013, but now believe it could provide a breakthrough on the case.

According to police accounts, Raasch went missing in October 1984 after friends dropped her off at the intersection of highways 54 and JJ. She planned to travel home to Merrill. Hunters found Raasch's body in November, about 2 miles from the intersection.