AK TPTK - can I lay this down to CRAI on the river?

[KCrow]

Villain is 17/10/4.77 - Stats look a little nittish but about 20hands earlier I saw him call a 5bet AI for 100bb with 77 preflop.

Could I have played this hand any differently, is this just throwing cash away if I fold? I don't really see what I beat apart from AJ, AQ and AT, and I don't really see these hands being played like this.

Full Tilt Poker, $0.25/$0.50 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

SB: $20.50
BB: $49.50
UTG: $113.80
CO: $50
Hero (BTN): $50

Pre-Flop: K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/diamond.gif[/img] dealt to Hero (BTN)
2 folds, <font color="red">Hero raises to $1.75</font>, SB folds, BB calls $1.25

Flop: ($3.75) 5[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/heart.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $3</font>, BB calls $3

Turn: ($9.75) 8[img]/images/graemlins/club.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $7</font>, BB calls $7

River: ($23.75) 4[img]/images/graemlins/heart.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $10</font>, <font color="red">BB raises to $37.75 and is All-In</font>, Hero........