Hand at the End of live tourney 3 players left

[aucubbie]

end of a great live tourney and we are 3 handed blinds are 3k and 6k chip leader has roughly 80k, i am about 60k and other one is about 50k. I am in the small blind and chip leader is in the big blind. I have j4 off i call the small blind and chip leader (aggresive good player) checks, flop comes 2 4 6 rainbow i bet 10k chip leader calls the turn comes a j. So i have two pair I go all in he calls with 35 the nut straight. I am out in 3rd. Is their any advice on this hand on how to avoid going broke or did I just ran into a monster when i had a great hand with only 3 players.