And sometimes, poker is cruel

A very nasty hand from tonight's Mookie.

A simple question: does anyone not go broke here? I feel that I overplayed things badly on the river, but I don't think I can ever fold there.

Full Tilt Poker, NL Hold'em Tournament, 25/50 Blinds, 9 Players

UTG+1: 3,010
UTG+2: 3,065
MP1: 425
MP2: 4,920
Hero (CO): 4,900
BTN: 2,975
SB: 2,350
BB: 5,870
UTG: 3,010

Pre-Flop: (75) Q A dealt to Hero (CO)
4 folds, MP2 raises to 150, Hero raises to 450, 3 folds, MP2 calls 300

Flop: (975) A 3 Q (2 Players)
MP2 checks, Hero bets 450, MP2 calls 450

Turn: (1,875) 6 (2 Players)
MP2 checks, Hero bets 850, MP2 calls 850

River: (3,575) K (2 Players)
MP2 bets 1,500, Hero raises to 3,150 and is All-In, MP2 calls 1,650

Results: 9,875 Pot
MP2 showed A A (three of a kind, Aces) and WON 9,875 (+4,975 NET)
Hero showed Q A (two pair, Aces and Queens) and LOST (-4,900 NET)