FBI to investigate Milwaukee police MILWAUKEE, Oct. 11 (UPI) -- The FBI and the U.S. Department of Justice will investigate the Milwaukee police department after a suspect died in custody, law enforcement officials said. U.S. Attorney James Santelle said a full-fledged investigation of the department is warranted after Derek Williams, 22, died in July 2011 after a video shows him gasping for air and begging for help for eight minutes as officers ignored him. Williams was arrested on suspicion of robbery, the Milwaukee Journal Sentinel reported. A medical examiner initially ruled Williams' death came from natural causes, but has since changed the finding to "homicide." In legal terms, that means he died "at another's hand" though it does not carry criminal implications on its own. The officers who arrested Williams have not been charged, though Santelle noted the outcome of his investigation could lead to criminal charges if he finds them warranted, the Journal Sentinel reported. Milwaukee residents, particularly those in the black community, have complained about the department for years, citing incidents of brutality, mistaken arrests and inaccurate crime statistics reported to the FBI, the newspaper said.