i passed the hand and he showed j,10
WHAT A LAY DOWN!!!

I think it's a marginal call/fold decision even if you know he has JT:
Any 4 or Ace ties the pot --> 6/44 x +$36 = $4.91 equity
The $36 is the profit you would make from making the call: (($92 current pot + $20 your turn call)/2 split pot) less $20 your turn callAny 9 wins you the pot --> 3/44 x (say) +$180 = $12.27 equityThe $180 is the profit you would make from making the call: $92
current pot + $88** your river bet into the $112 potSo that's less than a $3 (-EV) call ($20 - $4.91 - $12.27) if you know you're up against JT.The fact that there are several other hands that you are favourite over has to make the $20 turn call a +EV move I would have thought.
**This amount is speculative, and if the
fell (giving you the winning hand Vs his JT) then this amount may be lower. However if he was drawing to the flush, then he would most likely call a larger bet than this.Add the fact that any K or Q splits the pot aswell, and if you know he has J10 it becomes a +EV play to call. However, you did't know, and given his rock style stats, and possible range you put him on it is a marginal call either way and I see nothing wrong with the laydown (against this particular player).