A 35-year-old man has been charged with the alleged murder of his partner at their Warnbro home.
It is alleged the man assaulted mother-of-four Erica Hay at the property on Currie Street sometime between 7.30am on Thursday and 1am on Friday.
He then allegedly set the house on fire while Ms Hay was still inside.
Her body was later discovered by emergency services.
The accused allegedly fled the burning home with Ms Hay's three-year-old daughter who was taken to Rockingham Hospital with smoke inhalation.
The 35-year-old South Kalgoorlie man has been charged with one count of murder and one count of criminal damage by fire.
He is due to appear in the Perth Magistrates Court today.
18-year-old male from Lakelands charged over incident in Pinjarra
BREAKING: Reports of a man armed with a firearm in the Pinjarra area
Hayden Ballantyne signs with Rockingham Rams
Mayor reassures community that 'no decision has been made' to close 4WD access at Tim's Thicket, White Hills beaches
DBCA 'sick and tired' of illegal access to Port Kennedy Scientific Park
Mandurah homeless camp goes up in flames
Dawesville community shocked after kangaroo deliberately mowed down
Teens armed with knife, scooter charged over Rockingham Shopping Centre fight
Mandurah private school teacher charged with alleged sexual abuse of male student