Defense says new evidence includes hairs that could tie two others to crime . The FBI is investigating the case as a possible hate crime. Appeal filed last week in federal court . Damien Echols is on death row ; others serving life sentences .
Defense says new evidence includes hairs that could tie two others to crime . Police chief says he 'll take another look at case if court asks . Appeal filed last week in federal court . Damien Echols is on death row ; others serving life sentences .