Acting on a tip from January, investigators are digging up a vacant field that could hold the key to the mysterious disappearance of Jimmy Hoffa.

According to WXYZ, members of the FBI and the Oakland County, Mich. Sheriff's Department began investigating a plot of vacant land on Monday . It's located east of Adams Road and north of Buell Road in rural Oakland Township.

(See video above. Scroll down for updates and watch live feed from the dig site at WXYZ.)

Back in 1972, reports WXYZ, suspected Detroit mobster Jack Tocco purchased 45 acres of land near the vacant field. Hoffa, the head of the Teamster's Union, went missing in 1975, after possibly being kidnapped en route to the former Machus Red Fox restaurant in the Metro Detroit suburb of Bloomfield Twp.

The Tocco family reportedly incorporated the land into a family business and later built homes on it, according to WXYZ.

Federal agents first heard about the vacant property in January, when the son of Joseph Zerilli, known as one of the city's legendary alleged crime bosses, came forward. Anthony "Tony" Zerilli, 85, told investigators that Hoffa's body was buried in a shallow grave in the Oakland Twp. field. Plans to move his body were abandoned.

But the FBI might have reason to doubt Zerilli's story. For one, it was reported in January that he's writing a book. The 85-year-old also said he has knowledge of Hoffa's death from his father, although he claims to have never been a mobster, and was serving time at the time of the disappearance.

Zerilli said it's important that people know the truth.

"I’d like to just prove to everybody that I’m not crazy," Zerilli told NBC. "And it means a lot to me. What happened, happened while I was in jail. And I feel very, very bad about it and it should never have happened to Jim Hoffa. He didn’t deserve what happened to him."

Although Hoffa disappeared nearly 40 years ago, the feds haven't given up trying to locate his remains around Metro Detroit. Investigators have searched beneath many innocuous suburban fixtures for the Teamster boss's body: a backyard swimming pool, Roseville driveway, Detroit home and even a horse farm.

UPDATE: 12:20 p.m. -- Investigators are digging around a cement slab in the middle of the Oakland Twp. field, according to WXYZ. Watch live feed from the dig site at WXYZ.


UPDATE: 2:20 p.m. -- An attorney for Tony Zerelli told WXYZ that Hoffa's body is buried underneath the cement slabs where investigators can currently be seen digging. "The body is in that field, no doubt about it," Attorney David Chasnick told WXYZ.

Check out the slideshow for a few more theories about what may have happened to Jimmy Hoffa.

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  • Jimmy Hoffa Rumors

    In this Sept. 30, 1957, photo Jimmy Hoffa, Teamsters vice president and leading candidate to succeed Dave Beck as the IBT's new president, waves to delegates at the opening of the Teamsters Union convention at Miami Beach, Fla. Hoffa'’s mysterious disappearance in 1975, assumed death and myriad searches for his body have been the stuff of urban legends for more than three decades. (AP Photo/File)

  • Hoffa's Disappearance

    In this Aug. 1, 1975 file photo Bloomfield Township Police Chief Robert Snell fields questions from reporters about the mysterious disappearance of former Teamster president Jimmy Hoffa. Hoffa was reported missing on July 31, 1975, after meeting with reputed Detroit mob enforcer Anthony "Tony Jack" Giacalone and alleged New Jersey mob figure Anthony "Tony Pro" Provenzano at a restaurant in Bloomfield Township, Mich. (AP File Photo)

  • The Search

    In this Dec. 5, 1975, file photo, a man walks over a rubble field in Jersey City, N.J., one of the locations where authorities searched for the body of missing former Teamster boss Jimmy Hoffa. (AP Photo, File)

  • Josephine Hoffa, Barbara Crancer

    In this Aug. 14, 1975, file photo Josephine Hoffa, right, wife of ex-Teamster president Jimmy Hoffa, and her daughter Barbara Crancer walk behind the family home in Lake Orion, Mich. Crancer, seeking information on her father, filed a Freedom of Information Act lawsuit against the FBI in 1989 demanding the agency's reports on her father's disappearance. (AP Photo, File)

  • Hoffa's Friend Chuckie

    FILE - In this May 26, 2006, file photo, long-time Jimmy Hoffa friend, Charles "Chuckie" O'Brien, holds a photo of Hoffa and his wife Josephine, in Boca Raton, Fla.. (AP Photo/J. Pat Carter, File)

  • 2003: Under A Pool?

    FILE - In this July 16, 2003, file photo, authorities search under a backyard pool in Hampton Township, Mich., for evidence linked to the disappearance of ex-teamster boss Jimmy Hoffa. (AP Photo/Paul Sancya, File)

  • Hampton, Mich. Pool Search

    FILE - In this July 16, 2003, file photo, Oakland County sheriff investigators search near a backyard pool in Hampton Township, Mich., for evidence linked to the disappearance of ex-teamster boss Jimmy Hoffa. (AP Photo/Carlos Osorio, File)

  • 2004: Murdered At Detroit House?

    Before his death, Jimmy Hoffa's friend Frank Sheeran said he accompanied Hoffa to a house in northwest Detroit for a mob meet. In his book about Sheeran, Charles Brandt says the man <a href="http://www.freep.com/article/20120927/NEWS05/309270107/jimmy-hoffa-search">shooting Hoffa in the head</a>.

  • 2006: Under A Horse Farm?

    FILE - In this May 24, 2006, file photo, workers, including Federal Bureau of Investigation evidence response team members, probe the ground near a demolished barn at a horse farm in Milford Township, Mich., where FBI agents investigating Jimmy Hoffa's 1975 disappearance were working for an eighth day. Hoffa’s mysterious disappearance, assumed death and myriad searches for his body have been the stuff of urban legends for more than three decades. (AP Photo/Paul Sancya, File)

  • FBI Searches Farm

    FILE - In this May 25, 2006, file photo, excavation crews dig up the site of a horse barn that was demolished as part of the FBI's search for the remains of Jimmy Hoffa in Milford Township, Mich. (AP Photo/Carlos Osorio, File)

  • 2009: Cremated At Detroit Cemetary?

    Police officer and crime novelist Jeffrey Hansen has his own theory -- Hoffa was killed at the home in northwest Detroit, then <a href="http://www.mlive.com/news/detroit/index.ssf/2009/09/local_cop_says_jimmy_hoffa_was.html">driven to a local cemetery and cremated</a>.

  • 2010: Under Giants Stadium?

    FILE - This Feb. 4, 2010, file photo, workers watch as a machine begins the demolition of Giants Stadium, in East Rutherford, N.J. Self-described hit man Donald "Tony the Greek" Frankos claims ex-Teamsters boss Jimmy Hoffa was buried under Giants Stadium, but the FBI found no evidence to support the claim.(AP Photo/Mel Evans, File)

  • Buried Under Giants Stadium?

    This March 22, 2009 file aerial photo shows Giants Stadium in East Rutherford, N.J. Self-described hit man Donald "Tony the Greek" Frankos claims ex-Teamsters boss Jimmy Hoffa was buried under Giants Stadium, but the FBI found no evidence to support the claim. (AP Photo/Mark Lennihan, File)

  • 2011: Buried Under The Renaissance Center?

    <a href="http://www.mlive.com/news/detroit/index.ssf/2011/12/former_chauffeur_jimmy_hoffa_b.html">One recent rumor</a> puts Hoffa under the General Motors Company World Headquarters and Renaissance Center complex, seen August 17, 2010 in Detroit, Michigan. Photo by Bill Pugliano/Getty Images

  • 2012: Buried Under Roseville Driveway?

    People photograph the driveway in Roseville, Mich., Wednesday, Sept. 26, 2012 <a href="http://www.huffingtonpost.com/2012/09/27/jimmy-hoffa-roseville-tip-police_n_1919943.html">where police plan to take soil samples Friday</a> after a tipster said it could be the final resting place of missing Teamsters leader Jimmy Hoffa. Roseville Police Chief James Berlin says a man claims to have seen a body buried there approximately 35 years ago. Berlin says the man believes it could be Hoffa. (AP Photo/Carlos Osorio)

  • Other Rumors

    Plenty of others <a href="http://www.trutv.com/library/crime/notorious_murders/famous/jimmy_hoffa/5.html">claim to know the answer to Hoffa's disappearance</a>, whether he was dumped in a Florida swamp, crushed in a Hamtramck car compactor, dumped in the Au Sable River, or destroyed in a fat-rendering plant or many other rumored "possibilities."

  • Jimmy Hoffa Remains: Police to Dig Under Michigan Driveway

    It’s been almost 40 years since ex-Teamsters boss Jimmy Hoffa disappeared. Now, a tip has police moving to dig under a Michigan driveway.