There is very little information on this case.
November 7th, 1989 - St. Cloud Times

November 14th, 1989 - Minneapolis Star Tribune

“Heather was last seen alive leaving work at 3:30 pm on Thursday, 2 November 1989 from the main office of NSP (now known as Excel Energy), 414 Nicollet Mall in downtown Minneapolis. She was known to usually take the 16 bus to her apartment at Cedar Square East in the west bank area of the University of Minnesota”I found a case summary from 2020
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Heather Lamperd murdered 3 November 1989 | The Published Pen
The murder of 26-year-old Heather Lamperd of Minneapolis on November of 1989thepublishedpen.com