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An autopsy was performed.
Initial findings noted no external trauma to either individual, they added.
Carbon monoxide and toxicology tests were requested for both individuals.
Gene Hackman and Betsy ArakawaGetty Images
The manner and cause of death has not been determined.
The official results of the autopsy and toxicology reports are pending.
This remains an open investigation.
Deputies then secured the scene and notified the criminal investigations division.
Due to the unusual circumstances of two decedents in the residence there was a concern for scene safety.
Hackman and classical pianist Arakawa had been married since 1991.
They had no children of their own but are survived by three children from Hackmans first marriage.
