A 35-year-old man has been charged with the murder of Erica Hay, a 30-year-old mother of four, in south Perth.

The accused allegedly assaulted Hay and set their shared home ablaze, where her body was found.

Hay's three-year-old child was hospitalized due to smoke inhalation resulting from the fire.

The man from South Kalgoorlie faces charges of murder and criminal damage by fire and is set to appear in court.

The incident has highlighted ongoing concerns about violence against women in Australia.

Friends of Hay have paid tribute to her as a 'beautiful and caring' individual with a 'goofy' personality.