The remains of notorious 1930s gangster John Dillinger – reportedly entombed beneath 5,000 pounds of concrete at an Indianapolis cemetery – are set to be exhumed decades after the infamous killer was gunned down by FBI agents.

The Indiana State Department of Health approved a permit July 3 that was sought by Dillinger’s nephew, Michael C. Thompson, and will result in the body being exhumed from Crown Hill Cemetery and then reinterred there, The Associated Press reported.

Why? Details are scarce, but a History Channel spokesperson told the Indianapolis Star it was for an "upcoming project," without elaborating.

Health Department spokeswoman Jeni O’Malley says the agency expected Dillinger’s remains to be exhumed and reinterred Sept. 16, based on the permit. The Crown Hill Cemetery said it had no information regarding the plans.

The FBI said Dillinger’s gang killed 10 people during bank robberies and other crimes in the 1930s – and at one point, according to Fox 59, he was charged in the murder of an Indiana police officer but was never convicted.

ARIZONA, INDIANA TOWNS AT ODD’S OVER JOHN DILLINGER’S GUN

FBI agents killed Dillinger in July 1934 outside Chicago's Biograph Theater, where he had just seen the Clark Gable movie "Manhattan Melodrama."

When Dillinger’s body was brought back to his birthplace of Mooresville, Ind., a crowd of nearly 10,000 gathered to catch a glimpse, the Indianapolis Star reported.

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The gangster, who lived to be 31, was the subject of the 2009 film “Public Enemies,” in which he was portrayed by actor Johnny Depp.

Dillinger’s family reportedly ordered two and a half tons of concrete to be placed over his grave after reports emerged that attempts might be made to steal his corpse, according to the Indianapolis Star.

Fox News' Mike Arroyo and The Associated Press contributed to this report.