NEW : Police believe murder was planned for him . NEW : Suspect 's contact appears to be with police , not civilians , police say . Hundreds of officers resume search operations after apparently closing in on suspect . Eric Matthew Frein , 31 , a self - taught photographer , is wanted in state senator 's death .
NEW : Police believe ambush was planned for months . NEW : Suspect 's battle appears to be with police , not civilians , authorities say . Hundreds of officers resume search hours after apparently closing in on suspect . Eric Matthew Frein , 31 , a self-taught survivalist , is wanted in state trooper 's death .