Another victim is 21-year-old Brooke Philips who was also pregnant.
Her cause of death has also been ruled multiple gunshot wounds.
She had recently worked at the world-famous Bunny Ranch Brothel in Nevada.
The man who rented the house where the bodies were found is Jose Fierro.
He has talked to Police and may be a witness to the crime.
Police have not confirmed the identities for the other two adults nor the cause of death.