Opp is 19/7/1.7, no real other reads.

How is this line? Fold the flop to the re-raise? What do I do on the river?

Full Tilt Poker
No Limit Holdem Ring game
Blinds: $0.10/$0.25
9 players
Converter

Stack sizes:
UTG: $25.35
UTG+1: $22.30
MP1: $123.55
MP2: $21.90
MP3: $11.30
CO: $11.60
Button: $25.25
SB: $26.55
Hero: $24.05

Pre-flop: (9 players) Hero is BB with 8 7
3 folds, MP2 calls, 2 folds, Button calls, SB folds, Hero checks.

Flop: 6 5 K ($0.85, 3 players)
Hero checks, MP2 checks, Button bets $0.75, Hero calls, MP2 raises to $2.25, Button folds, Hero calls.

Turn: 6 ($6.1, 2 players)
Hero checks, MP2 checks.

River: 9 ($6.1, 2 players)
Hero bets $5, MP2 raises all-in $19.4, Hero ????