KK river decision, I am confused

[Choparno]

Villain is 20/14/2.9. Appears your typical TAG.

I don't understand the river shove. If he's bluffing there are two possibilities: either he is good enough to turn a made hand like JJ into a bluff, putting me on KK/QQ (seems unlikely?), or it is just some random hand.

The problem I have with this hand is that I can't see how either a random hand that is now bluffing, or AK/AQ that is pushing for value, would float the flop OOP. Basically I can't see how he can have an A OR a bluff. Thoughts?

2/4 NL, 5 players

Stacks:
Hero (CO) ($1,044.44 in chips)
BTN ($301.70 in chips)
SB ($400.00 in chips)
BB ($436.40 in chips)
MP ($484.70 in chips)

Preflop: Hero is CO with K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img]
MP raises to $12, Hero raises to $40, 3 folds, MP calls $40

Flop ($86): 4[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img]
MP checks, Hero bets $65, MP calls $65

Turn ($216): A[img]/images/graemlins/heart.gif[/img]
MP checks, Hero checks

River ($216): T[img]/images/graemlins/heart.gif[/img]
MP bets all-in $379.70, Hero ??