TP en turn vs donk d fish

Poker Stars $0.50/$1 No Limit Hold'em - 6 players

SB: $109.72

BB: $105.34

UTG: $137.74

MP: $114.84 55/17/2 en 115 manos

CO: $70.73

Hero (BTN): $149.03

Pre Flop: ($1.50) Hero is BTN with KDIAMONd 4DIAMONd

1 fold, MP calls $1, 1 fold, Hero raises to $4.50, 2 folds, MP calls $3.50

Flop: ($10.50) K:club: J:club: T:spade: (2 players)

MP checks, Hero bets $8, MP calls $8

Turn: ($26.50) 7:spade: (2 players)

MP bets $12, Hero ?