given that he's had ample opportunity to fold i'm not seeing him having much thats going to fold to another bet on the river. he'd have to give you credit for a J or better after the turn. and if thats the case he should either fold or raise the turn, unless he's looking for value with something solid, call turn fold river is a pretty speww line for him to take no? ..call turn seems more like big hand looking for value on this board