NL25 AJo Coldcall OOP - weird Line?

[mic23]

Grabbed byHoldem Manager
NL Holdem $0.25(BB) Replayer
SB ($22.45)
Hero ($24.90)
UTG ($20.40)
UTG+1 ($87.25) 62/17/1.5/52
CO ($14.95) 93/35/2.1/42
BTN ($16)

Dealt to Hero J:spade: A:club:

fold, UTG+1 raises to $0.75, CO calls $0.75, fold, fold, Hero calls $0.50,

FLOP ($2.35) K:diamond: 8 9:club:

check, check, CO bets $0.50, Hero calls $0.50, UTG+1 calls $0.50,

TURN ($3.85) K:diamond: 8 9:club: T:diamond:

Hero bets $2.60, UTG+1 calls $2.60, CO calls $2.60,

RIVER ($11.65) K:diamond: 8 9:club: T:diamond: 2:club:

check, check, CO bets $4, Hero?

Raise Pre? Donk Flop? Donk river?