Villain is 16/8/4 over 100 hands, no post-flop reads, because I don't remember him ever being at a table before. on Turn I put him on AK,KK so check behind? Is river call spewing?

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($127.70)
UTG ($173.55)
MP ($64.45)
CO ($50.70)
Hero ($46.60)
SB ($45.55)

Preflop: Hero is Button with Q, A.
2 folds, CO raises to $1.5, Hero calls $1.50, 2 folds.

Flop: ($3.75) 4, Q, T (2 players)
CO bets $2, Hero calls $2.

Turn: ($7.75) A (2 players)
CO checks, Hero checks.

River: ($7.75) 2 (2 players)
CO bets $5, Hero calls $5.