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If not foul play, looks like CO poisoning on the very limited details
In Ireland at least "foul play is not suspected" isa euphemism for suicide
The reference to the death of the dog is what makes me think CO, but agree on what you're saying as the other potential path.
Welp... "Suspicious" and no sign of gas leak/poisoning https://www.nbcnews.com/news/us-news/gene-hackman-wife-found-dead-investigation-santa-fe-sheriffs-rcna193960