Emergency services were called to a home in High Street in Kangaroo Flat just before midnight to reports the 46-year-old had been stabbed.
Osias was found injured and rushed to hospital, but couldn’t be saved.
A close friend of Osias said she was a loving mother who did “everything” for her children.
“She’s a good mum, she’s a good friend and she does everything for her kids and they adore her,” the friend told reporters.
“She’s just lovely, and everyone around her will say the same.
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“As a mum, she’s always there for her kids.”
Around five hours after the alleged attack, police found a 44-year-old man in a reservoir near the woman’s home.
The man was arrested and questioned by police.
It’s understood he was known to Osias.