About 9.30pm on Monday night, police rushed to the family home of anaesthetist Dr Andrew Carll in Rockhampton, Queensland.
They were responding to a frantic triple-0 call: A man had discovered the bodies of Carll, 58, and his wife Julie Rush, 49 in the main bedroom of their Frenchville home.
This call came from a male relative - believed to be one of the couple's three sons.
Queensland police confirmed Rush was the deceased woman on Wednesday. They are yet to formally identify the deceased man, but family and friends have said it is her husband.
Police said a firearm was used, and they are not looking for anyone else in relation to the killings.
On Thursday night, Carll’s sister Mary Carll confirmed her brother and sister-in-law had died in an apparent murder-suicide.
In an emotional Facebook post, she expressed anger at her brother’s actions.