Federal officials are investigating the November 2011 death of Darrin Hanna, who was beaten by North Chicago police responding to a domestic disturbance call in his home and later died, authorities announced Tuesday.
The U.S. state's attorney Office in Chicago is investigating the case after a request by Lake County State's Attorney Michael Nerheim in early 2013.
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Nerheim was asked by several of Hanna's relatives to review a previous investigation because of new evidence, officials said in a news release.
"In response to this request from members of the community, I decided to refer this case to the U.S. Attorney's Office for an independent investigation," Nerheim said in a statement. "Considering all of the circumstances, I decided the best way to proceed was for a new law enforcement agency with no prior involvement in this case to conduct an independent investigation."
Until Tuesday, officials had not disclosed the involvement of federal officials.