Police suspect the man had died potentially years ago in the home, where his wife and stepson also lived.
On April 17, officers came to the home on Edinburgh Road in Benowa and found the body.
Because of how long the 69-year-old man has been dead, police have not yet been able to determine if he has any injuries which could indicate the cause of death.
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Nobody has been charged and police have not said if the death was suspicious.
Investigations are ongoing.