WAUPACA - The Waupaca County sheriff says he's optimistic that investigators will solve two murder cases from 1992 and 1978 in the next year.
Sheriff Brad Hardel tells Post-Crescent Media (http://post.cr/199rfRD) that investigators have made progress on both cold cases.
In 1992, 23-year-old Tanna Togstad and her boyfriend, 35-year-old Timothy Mumbrue, were found stabbed to death in her Royalton farmhouse. Authorities said in February 2013 that a man who was convicted of rape in Wisconsin and killing a man in Oklahoma was a person of interest in the 1992 double homicide. Officials said DNA testing tied him to the case.
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