Posted by 
Police have begun a double murder-suicide investigation after a man shot two women before turning the gun on himself at a home in Perth's west.
Police believe the 63-year-old was searching for his ex-partner before he shot a gun that killed two women and himself at a home on Berkeley Crescent in Floreat around 4.30pm (6.30pm AEST) yesterday.
Police said that the 59-year-old woman was a friend of the man's ex-partner.
READ MORE: American Airlines retreats after blaming girl, 9, for not seeing hidden camera in a lavatory
Officers confirmed the former partner was not at the home but the two women, including the 18-year-old daughter of the 59-year-old, were "tragically" killed.
The man was known to police however he had no known history of violence.
He was a licensed firearm holder in WA, police said today.
"These are distressing circumstances," Detective Inspector David Gorton said.
"Any death is tragic, when you have a multiple murder it has that greater impact on the family, the friends, the first responders, and certainly the community at large," he said.
"We're not treating this as a family violence matter."
This morning police confirmed that the 18-year-old lost her life in hospital after she was transported there in a critical condition yesterday afternoon.
Police said a large amount of police resources were deployed to the area yesterday, including the Tactical Response Group and specialist detectives.
READ MORE: Police investigate after teenager shot in Melbourne's north
An investigation into their deaths is ongoing.
"WA Police will continue to provide support and assistance to the family, friends and first- responders affected by this tragic incident."
Lifeline can be called on 13 11 14 or at www.lifeline.org.au.
