Glendon Gouker appeared before Waupaca County Judge John Hoffmann Friday,March 8, and entered a guilty plea to the charge of first-degree sexual assault with a weapon.
The conviction includes a penalty enhancer for a Class B felony of up to 60 years in prison.
Gouker was charged on Feb. 4 and extradited from Oklahoma where he awaits trial for rape and homicide.
Gouker’s guilty plea was for the attack and rape of an Iola woman in 1990. His DNA was identified as part of the evidence of the crime.
The 41-year-old Gouker continues to be a person of interest for investigators of an unsolved double homicide. In 1992, 23-year-old Tanna Togstad and 35-year-old Tim Mumbrue, were found brutally murdered in a farmhouse just north of Weyauwega.
Assistant Attorney General Jeffrey Gabrysiak with the Wisconsin Department of Justice prosecuted the case against Gouker.