Sick sick flop

Check this out for a sick hand. The other player was pretty solid and knew how to play the game. Here we are heads up in a 6 player STT. I managed to come back and win, but I thought I had him here:

PokerStars Game #14690768572: Tournament #74482301, $6.00+$0.60 Hold'em No Limit - Level V (75/150) - 2008/01/20 - 08:34:07 (ET)
Table '74482301 1' 6-max Seat #2 is the button
Seat 2: DeaconM (3445 in chips)
Seat 3: ashhen (5555 in chips)
DeaconM: posts small blind 75
ashhen: posts big blind 150
*** HOLE CARDS ***
Dealt to ashhen [3s Ah]
DeaconM: calls 75
ashhen: raises 450 to 600
DeaconM: calls 450
*** FLOP *** [4d 5d 2s]
ashhen: bets 150
DeaconM: raises 150 to 300
ashhen: calls 150
*** TURN *** [4d 5d 2s] [Kh]
ashhen: bets 150
DeaconM: raises 750 to 900
ashhen: raises 750 to 1650
DeaconM: raises 895 to 2545 and is all-in
ashhen: calls 895
*** RIVER *** [4d 5d 2s Kh] [5s]
*** SHOW DOWN ***
ashhen: shows [3s Ah] (a straight, Ace to Five)
DeaconM: shows [3d 6d] (a straight, Deuce to Six)
DeaconM collected 6890 from pot
ashhen said, "nooooooooo"
*** SUMMARY ***
Total pot 6890 | Rake 0
Board [4d 5d 2s Kh 5s]
Seat 2: DeaconM (button) (small blind) showed [3d 6d] and won (6890) with a straight, Deuce to Six
Seat 3: ashhen (big blind) showed [3s Ah] and lost with a straight, Ace to Five