AK gegen donk am Turn

[StyloAl]

3/6 Fixed-Limit Hold'em (6 handed)
Hand recorder used for this poker hand: Texas Grabem 1.9 by www.pokerstrategy.com.

Preflop: Hero is CO with K, A
MP2 folds, MP3 raises, Hero 3-bets, BU folds, SB calls, BB calls, MP3 calls.

Flop: (12.00 SB) 4, K, 8 (4 players)
SB checks, BB checks, MP3 checks, Hero bets, SB calls, BB calls, MP3 folds.

Turn: (7.50 BB) T (3 players)
SB bets, BB folds, Hero raises, SB 3-bets, Hero calls.

River: (13.50 BB) 2 (2 players)
SB bets, Hero calls.

Final Pot: 15.50 BB

easy Value raise am Turn? Villain ist unkown