Who won this game of poker?

First off, both players could not have the 3c in their hand. Secondly, the board would have 5 cards, not 4. Of the cards so far, first player's best hand is JJJK3 and second's is JJJ43. The first player would win unless the river was a deuce (which would give both players a full house and split pot) or a 4 (giving the second player the win.)