MP is fairly unknown, 11/11 over 9 hands.

BU is 28/16/5 over 51 hands.

PokerStars - $0.50 NL (6 max) - Holdem - 5 players
Hand converted by PokerTracker 4

UTG: $51.50
CO: $104.96
BTN: $65.18
Hero (SB): $67.59
BB: $50.75

Hero posts SB $0.25, BB posts BB $0.50

Pre Flop: (pot: $0.75) Hero has K A

UTG raises to $1.12, fold, BTN calls $1.12, Hero raises to $5.25, fold, UTG calls $4.13, BTN raises to $65.18 and is all-in, Hero ???

I feel like this is one of those standard spots where I should know what to do by now, but I'm still unsure sometimes. This is one of those times.