The Tic-Tac-Toe Killer

One twisted mind involving everyone in his own sinister version of a seemingly innocent game. Victims being found with a 3 by 3 grid sliced into their faces and a mark in one of the sections. O or X? Can detective Jenn Jasper win the game in order to save everyone? Or will she be the one to give the killer his 3 X's or 3 O's? XOXOXO