The Case Breakers, a nonprofit group of cold case investigators, said the body of Teamsters President Jimmy Hoffa, which has been missing for decades, may be buried at a demolished MLB stadium.

An ace of spades playing card with “scribbled handwriting” from a dying ex-sergeant led the group to the old site of Milwaukee County Stadium in Wisconsin, the New York Post reported.

The location is next to the current Milwaukee Brewers stadium, American Family Field. The group believes Hoffa is buried under where the demolished stadium’s third-base line was located.

Read more: