Bad sample size on the guy, so no stats and no reads.

$0.05/$0.1 No Limit Holdem
6 players
Converted at weaktight.com

Stacks:
UTG Yankeezss ($9.25)
UTG+1 er fabietto ($4.70)
CO 22dar ($5.40)
BTN Hero ($15.25)
SB Fret_1987 ($15.50)
BB Maximilian91 ($9.95)

Pre-flop: ($0.15, 6 players) Hero is BTN
1 fold, er fabietto calls $0.1, 22dar calls $0.1, Hero raises to $0.6, 1 fold, Maximilian91 calls $0.5, er fabietto calls $0.5, 22dar folds

Flop: ($1.95, 3 players)
Maximilian91 checks, er fabietto checks, Hero bets $1.3, Maximilian91 folds, er fabietto calls $1.3

Turn: ($4.55, 2 players)
er fabietto checks, Hero checks

River: ($4.55, 2 players)
er fabietto bets $2.4, Hero?

Is he doing this with 66-TT? How about diamond draws?