DENVER - The death of a homeless preacher inside the Denver jail in 2010 has prompted an inquiry by the FBI.
Marvin Booker died after Denver Sheriff's Deputies restrained him inside the booking area of the downtown jail.
While the deputies have been cleared of any criminal wrongdoing, the family of Booker has filed a civil suit in the case.
"The FBI has contacted us seeking assistance in their federal investigation into Mr. Booker's death.
They have asked that we provide to them documents and transcripts of testimony by the guards that were involved in the killing," attorney Darold Killmer told 9NEWS on Thursday.
Booker died shortly after deputies restrained the homeless man using a taser and a prolonged head lock. While an autopsy report labeled the death a homicide, it also stated that Booker had cocaine in his system as well as an enlarged heart. Denver prosecutors declined to file charges and an internal investigation suggested the deputies did not violate the department's use of force policy.
Family and friends of Booker have repeatedly said that Booker was simply going for his shoes when he was tackled by numerous deputies.
Late last year a federal judge denied Denver's request to toss the civil case.
It's unclear if the U.S. Department of Justice will launch a formal civil rights investigation into the matter, and the FBI's involvement now does not guarantee any federal action.
Even Kilmer acknowledged the chances of a further review are slim.
"Given the recent decision by the federal authorities to not pursue the case relating to the brutality inflicted upon Alex Landau by the Denver Police, we have reason to believe that any such investigation will lead to anything," Killmer stated.
Earlier this month the U.S. Department of Justice announced it would not charge Denver Police officers with civil rights violations during the 2009 beating.
Denver has vigorously defended its position that its deputies did nothing wrong in the Booker case.