[Fai Mao]

Carbon monoxide poisoning give you a head ache. That explains the pills

https://www.pennmedicine.org/for-patients-and-visitors/patient-information/conditions-treated-a-to-z/carbon-monoxide-poisoning

[IYAS9YAS]

Carbon monoxide poisoning give you a head ache. That explains the pills

The Santa Fe Sheriff thinks there is enough that is suspicious that he's not ruling out foul play. The gas company tested the property. No gas leaks and no CO leaks.