The FBI is hunting down what could be the most solid lead they have ever had in the search for Jimmy Hoffa's remains.

The Detroit Free Press reported Monday that the bureau is executing a search warrant to search a field near where Hoffa was last seen in 1975. The former Teamsters boss vanished more than four decades ago and his disappearance and cause of death have been an utter mystery.

According to CNN, the lead is based in part on information provided by Tony Zerilli, an alleged former mobster. He was released from prison in 2008 and, earlier this year, told NBC New York that Hoffa was buried in a field in Michigan some 20 miles north of the restaurant where he was last seen.

The FBI took this information and investigated for months before actually seeking the proper court authorization to renew the search.

"It's my fondest hope that we can give ... closure not just to the Hoffa family, but also to the community and stop tearing that scab off with every new lead and bring some conclusion," Oakland County Sheriff Michael Bouchard told the Free Press.

Neither Bouchard nor FBI Special Agent in Charge Robert Foley III disclosed how long the search would take or what led them to the site.

"Because this investigation is an open investigation and the search warrant is sealed, I will not be able to provide any additional details regarding our activity here," Foley said, as a truck carrying a backhoe pulled down a road to the site behind him. "However if information does become available to the extent that we can share it, we certainly will."

Hoffa was reportedly kidnapped on July 30, 1975 outside what was the Machus Red Fox restaurant in Bloomfield Township. Since then, not a single trace of his could be found. Since initial efforts to locate him were unsuccessful, his presumed date of death was that day.

Hoffa had been out of jail for a short time before he went missing. His prison sentence ended early in part to an agreement with President Ronald Reagan that he would be barred for life from the Teamsters.

Despite the agreement, Hoffa was supposedly trying to regain power in the labor union and investigators believe this may have had something to do with his disappearance. Hoffa was also believed to have had organized crime ties.