The identity of a 22-year-old man shot and killed by police in Western Australia after he allegedly threatened an officer with a knife has been released.
Police say they were responding to reports of a man behaving suspiciously in Wannanup just after midnight on Sunday when they spotted him with a knife and he lunged towards an officer, ignoring commands to drop the weapon.
Officers say they tasered the man, which didn't stop him approaching and he was then shot, later dying in hospital.
On Wednesday, police confirmed the deceased man was Hayden Paul Stacey.
His Facebook page showed he was a Mandurah-based carpenter's apprentice.
Homicide squad detectives and internal affairs are investigating if the two officers involved acted within their training and protocols.
Acting Deputy Commissioner Paul Steel said on Monday that based on the information available, he had no concerns about their actions.
"Both officers discharged their tasers but, unfortunately, their tasers were ineffective," Mr Steel said.
"The shot was fired by the officer who was directly at threat."