More than 20 years after a self-described mob hit man set the rumor mill in motion with an interview in Playboy magazine, the question lingers: Is the answer to one of the enduring mysteries of the 20th century buried beneath the stadium — and about to be buried even deeper when the stadium is demolished this spring?

To one former law enforcement official who investigated the case in the 1980s, there is no mystery.

The FBI considered the Giants Stadium tale "a dead issue" by the time Playboy printed its interview with Donald "Tony The Greek" Frankos in late 1989, according to retired FBI agent Jim Kossler.