Davontae Sanford, a Detroit man who went to prison as a teen for four slayings that were eventually linked to a professional hit man, is suing the city and two officers involved in his case.

The lawsuit was filed Monday in U.S. District Court in Detroit on behalf of Sanford. He was only 14 when charged in the killings in 2007. Prosecutors dropped the charges in 2016, after a Michigan State Police report said two other men were responsible.

The head of Detroit’s law department, Melvin (Butch) Hollowell, told the Detroit News the city doesn’t comment on pending litigation.