A man remains in a critical condition after being stabbed in a motel on Dunn Bay Road in tourist hot spot Dunsborough just after 9pm on Friday night.
Officers will allege a 37-year-old man walked up to a 33-year-old man who was sitting at a table and stabbed him several times before fleeing.
The men are known to each other.
The victim received critical injuries and was taken to Busselton Hospital before being airlifted to Royal Perth Hospital by the RAC Rescue Helicopter.
Thank you to the RAC Rescue Chopper, Ambulance Staff and associated Emergency Staff for assistance with a difficult job tonight. #StaySafe pic.twitter.com/enp8c6aIYh
— Busselton Police (@BusseltonPolice) March 24, 2017
A RPH spokesman said on Saturday morning the man was still critical.
The 37-year-old man from Dunsborough was arrested by police outside a restaurant a short time later.
He has been charged with intent to do grievous bodily harm to another and is due to appear in the Bunbury Magistrates Court on Saturday.