50nl at a site with no hand histories.

UTG ($17.14)
MP ($3.69)
CO ($96.85) playing 90/4, likes to stab buttons when checked to multiway.
BTN ()
SB ($64.05)
HERO (BB) ($58.37)

UTG limps, MP limps, CO limps, SB completes, Hero checks K3o.

Flop a gorgeous KK3 with two diamonds. All check.

Turn 2, SB checks, I check, UTG minbets, short stack folds, CO calls, SB calls, I raise to $2.5, UTG calls, fish calls, SB clicks back to $4.5, I think a little bit and call, the other two call behind me.

River T, SB bets $20.5 and I jam.