Betting the nuts on the river

[zook]

Background: Villain is a nit, 14/4 over 350 hands, but capable of stacking off with an overpair on a scary board (see first hand below). I've only been at the table ~3 orbits, but I've played a few hands and haven't shown anything down until this hand:

Full Tilt Poker - No Limit Holdem Ring game - Blinds: $1/$2 - 8 players - Converter
Stack sizes:
UTG: $108.65
UTG+1: $279.15
MP1: $278.35
MP2: $200
Hero: $197
Button: $202.60
SB: $158
BB: $201.55

Pre-flop: (8 players) Hero is CO with 6 5
UTG folds, UTG+1 calls, MP1 calls, MP2 folds, Hero calls, Button folds, SB calls, BB raises to $8, UTG+1 calls, MP1 folds, Hero calls, SB calls.

Flop: 5 4 5 ($33, 4 players)
SB checks, BB bets $15, UTG+1 folds, Hero raises to $60, SB folds, BB calls.

Turn: 7 ($154, 2 players)
BB checks, Hero is all-in $129, BB calls.

River: T ($410, 1 player + 1 all-in - Main pot: $410)

Results:
Final pot: $410
BB showed Qc Qd
Hero showed 6d 5d

Two hands later, same villain. River play?

Full Tilt Poker - No Limit Holdem Ring game - Blinds: $1/$2 - 9 players - Converter
Stack sizes:
UTG: $278.35
UTG+1: $200
Hero: $407
MP2: $202.60
MP3: $153
CO: $200
Button: $200
SB: $106.65
BB: $271.15

Pre-flop: (9 players) Hero is MP1 with A K
2 folds, Hero raises to $10, 3 folds, Button calls, 2 folds.

Flop: J T 3 ($23, 2 players)
Hero bets $20, Button calls.

Turn: 5 ($63, 2 players)
Hero bets $40, Button calls.

River: 2 ($143, 2 players)
Hero...

[Renton]

if he's aggressive i check, if not i bet all in.

[nutsinho]

if he's aggressive i check, if not i bet all in.

absolutely