His attorneys have said he is not denying guilt but is holding off on a guilty plea in the hopes that prosecutors will not seek the death penalty. (sun-sentinel.com)
They will seek the death penalty in the case. (wunc.org)
But it's more of hiccup than a hurdle as the Aussies will be more than happy to turn the guy over if the United States if the Prosecutor's office assures they will not seek the death penalty for this particular case. (law.stackexchange.com)