A body believed to belong to Pia Farrenkopf was found mummified last week in the garage of her Pontiac home.
Based on initial tests, experts believed she died in 2008, but voting records show Farrenkopf cast a ballot in 2010, Newser reports.
Investigators haven't confirmed the body is Farrenkopf, who was unwed and childless. But they have said the woman apparently died in 2008 at the age of 49, according to the Associated Press, which matches Farrenkopf's age at the time.
Pontiac city records indicate Farrenkopf registered to vote in 2006 and that she went to the polls for the first time in 2010. Officials say it's possible the 2010 vote is an administrative error, according to the Detroit Free Press.
Investigators are treating the death as a homicide, MLive.com reports. They're trying to match DNA samples from the body with that of Farrenkopf's sister, hoping for a positive identification. They're also seeking dental records to identify the remains.
Another unanswered question is how the body remained undiscovered for years.
Neighbors said last week they believed Farrenkopf had gone to Germany. One of them mowed her lawn periodically. Mail went to a post office box and bills were set up to be paid automatically, until her bank account dried up in 2013. That led to the home's foreclosure and the discovery of the body, MLive.com reports.
A woman claiming to be Farrenkopf's niece has set up a Facebook page in hopes of finding out more information about the tragedy.