She was found dead in a shallow rural river. Authorities don't know why 37 years later

CHISAGO COUNTY, Minn. — It wasn t like Heather Lamperd to miss a visit with her grandmother. She had lived with her as a kid, in an apartment building in the Cedar Riverside neighborhood of Minneapolis. Even when Lamperd moved out in 1988, she didn t go far. She simply moved into her own apartment, in the same building. On any given day, her grandmother, Carolyn Devenport, saw her multiple times — and almost always for dinner. But on Nov. 2, 1989, she didn t show up at her door, not even for their regularly scheduled evening meal. That s when Devenport knew something was terribly wrong. Lamperd's body was found the next day, on Nov. 3, roughly 45 miles away in rural Chisago County. She was retrieved from the knee-deep waters of the Sunshine River, located just outside of North Branch, Minnesota. The 26-year-old who stood just 5 feet, 2 inches tall and weighed 110 pounds had been brutally beaten. She had a black eye, abdominal injuries and bruising thr