very tough spot 50nl

[themandude]

Starting game 2372288701.

Dikembe is at seat 0 with $52.35.
nassim1704 is at seat 1 with $36.30.
Gohanek1 is at seat 2 with $101.10.
prop-as is at seat 3 with $6.60.
-WilliamB- is at seat 4 with $154.84.
themandude is at seat 5 with $58.10.

The dealer is seat 1.

Gohanek1 posts a blind of $.25.
prop-as posts a blind of $.50.

(themandude is dealt Kh Ad.)

Pre-flop:
-WilliamB- raises $1.25.
themandude calls for $1.75.
Dikembe calls for $1.75.
nassim1704 folds.
Gohanek1 calls for $1.50.
prop-as folds.

The flop comes
7s Jh Ks.

Gohanek1 checks.
-WilliamB- checks.
themandude bets $6.
Dikembe calls for $6.
Gohanek1 folds.
-WilliamB- folds.

The turn comes 9c.

themandude bets $14.
Dikembe goes all-in for $44.60.


I just called williams raise because he is very tight like 12/5
I don't know what I should do here, I have no reads on him.