A "Free Matt Sopron" sign greets drivers along the Stevenson Expressway in Chicago on Jan. 5, 2016. Supporters of Sopron are trying to generate public interest in the case. (Zbigniew Bzdak/Chicago Tribune/TNS)
A "Free Matt Sopron" sign greets drivers along the Stevenson Expressway in Chicago on Jan. 5, 2016. Supporters of Sopron are trying to generate public interest in the case. (Zbigniew Bzdak/Chicago Tribune/TNS) Zbigniew Bzdak TNS
A "Free Matt Sopron" sign greets drivers along the Stevenson Expressway in Chicago on Jan. 5, 2016. Supporters of Sopron are trying to generate public interest in the case. (Zbigniew Bzdak/Chicago Tribune/TNS) Zbigniew Bzdak TNS