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Aretha Franklin, the Queen of Soul, left behind a big estate -- about $80 million -- and some mystery as well.

There's an active investigation into the possible theft of $178,000 from Franklin before her death last Aug. 16, Oakland County Chief Assistant Prosecutor Paul Walton tells Mike Martindale of The Detroit News.

“In June 2018, she filed a complaint with the Bloomfield Township Police that one of her checks was missing and believed stolen,” Walton said. “But unfortunately with her death, it is difficult to determine whether she actually passed it on to someone else who had the permission and authority to cash it."

“It may take more evidence or someone coming forward with more information about the transaction,” said Walton. "I would presume there is a chance that someone in the estate may pursue this as well,” he said.

Read more: The Detroit News