Investigators are not saying anything about how the couple died.
The couple reportedly traveled extensively. Police say the home was their base between trips.
The murders happened in the same area where an 83-year-old man was killed during a home-invasion robbery last month. Hanna Morcos died of a heart attack after the robber assaulted him and tied him up. A $10,000 reward is being offered for information leading to an arrest.
Neighbors of the couple found dead Friday evening say they rarely saw them.