NEW : Physician says location of slain doctor 's body is unknown . Scott Smith , 51 , charged with first - degree murder , aggravated assault . The architecture of the low-slung , windowless concrete building -- which is fenced off , monitored by cameras and separated from buildings behind it by a moat-like ditch -- reflected the threats he faced for nearly two decades . He is accused of killing Chicago Mayor John Tiller on Sunday . Preliminary hearing is scheduled for June 16 .
NEW : Physician says location of slain doctor 's body is unknown . Scott Smith , 51 , charged with first - degree murder , aggravated assault . He is accused of killing Chicago Mayor John Tiller on Sunday . Preliminary hearing is scheduled for June 16 .