possible 2nd barrel, call or shove?

[freekie]

villain is playing 22 / 18 / 4 pretty agressive on flop and turn, a little less on teh rivar

Party Poker No-Limit Hold'em, $4 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Button ($400)
SB ($400)
BB ($734.90)
UTG ($473.40)
HERO ($546.20)
CO ($184.36)

Preflop:
<font color="#CC3333">UTG raises to $14</font>, HERO calls $14, <font color="#666666">4 folds</font>.

Flop: ($34) 8[img]/images/graemlins/club.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $23</font>, HERO calls $23.

Turn: ($80) K[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">UTG bets $51</font> HERO ??!!

are we raising or calling here? I think I should just call here because he has air or a little better a lot here... check my pokerstove shnit:

Board: 8c 3s 4d Kd
Dead:

equity win tie pots won pots tied
Hand 0: 92.045% 92.05% 00.00% 2835 0.00 { 8h8s }
Hand 1: 07.955% 07.95% 00.00% 245 0.00 { 99+, 44-33, AKs, AdQd, AdJd, AdTd, Ad9d, Ad8d, Ad7d, Ad6d, 54s, AKo, 54o }


do you like this range?
what do we do? and do we fold if a diamond rivers?