An Indiana man who amassed an incredible collection of exotic artifacts and became the subject of an FBI probe last year has died.
Don Miller, 91, died Sunday, nearly a year after the FBI seized thousands of artifacts from all over the world, The Indy Star reports. 
The case has been shrouded in mystery since, and no charges or lawsuits were ever filed against Miller.
Even now, the FBI is declining to discuss the case.
But experts say his death could result in a headache for those sorting out which of the artifacts were legally acquired.
“Even just figuring out which ones are illegally possessed in the United States is an enormous task when he’s purchased them over so many years, so you can see why this is such a difficult problem to solve,” said David B. Smith, a Virginia-based attorney with a background in asset forfeiture.
“Without his help, it’s just going to be enormously difficult to figure out which ones he legitimately purchased, which are legal and which ones aren’t,” Smith said. “It’s a huge problem.”