Hand for discussion

[rawl316]

FullTiltPoker Game #256861952: Table Arville (6 max) - $0.25/$0.50 - No Limit Hold'em - 19:21:41 ET - 2005/10/18
Seat 1: knighter_a ($57.40)
Seat 2: rocco20v ($49)
Seat 4: kimonowarrior ($46.10)
Seat 5: tikhal ($39.50)
Seat 6: resniz001 ($35.25)
tikhal posts the small blind of $0.25
resniz001 posts the big blind of $0.50
The button is in seat #4
*** HOLE CARDS ***
Dealt to rocco20v [3d 3h]
knighter_a raises to $1
rocco20v calls $1
kimonowarrior folds
tikhal folds
resniz001 calls $0.50
*** FLOP *** [Td Ac 7h]
resniz001 checks
knighter_a checks
rocco20v bets $2
resniz001 folds
knighter_a calls $2
*** TURN *** [Td Ac 7h] [5c]
knighter_a checks
rocco20v bets $5
knighter_a calls $5
*** RIVER *** [Td Ac 7h 5c] [3c]
knighter_a checks

What would you do on the river here? Did the other guy flop a set? What range of hands do you put him on?