No history on villain, he is a good reg from what I know, seen him play 50/100 SH, this is one of the first hands in:

$10/$20 No Limit Hold'em Cash, 2 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

BB: $2,049 (102.5 bb)
Hero (SB): $2,010 (100.5 bb)

Preflop: Hero is SB with As Qs
Hero raises to $45, BB raises to $170, Hero calls $125

Flop: ($340) Ad 9d 9h (2 players)
BB bets $130, Hero calls $130

Turn: ($600) Tc (2 players)
BB checks, Hero checks

River: ($600) 7h (2 players)
BB checks, Hero bets $390, BB raises to $1,749 and is all-in

I know betting the turn is standard and wouldn't put me in this spot but as played my range is fairly capped and I know I am very likely to get attacked when I bet the river. I never have a 9 or better here so AQ is top of my range.
Upon thinking about this for a while other than Ax hands with no kicker I can't really think of what else he would take this line as a bluff with. 8x with no diamonds?