The Santa Rosa father of the baby killed by drugs has also died of overdose.
29-year-old Patrick Savoy Oneill was found alongside his 13-month-old son Liam Savoy Oneill on Saturday afternoon.
By phone, the child's mother Emily Guillory, told KTVU that the father doted on the toddler, would never intentionally harm him, and had been attending Narcotics Anonymous meetings.
Police are awaiting toxicology results, but it appears the toddler was exposed to fentanyl while in the room his father rented on Darek Drive.
Liam was found deceased on the floor, alongside his father, who was unconscious.
"My understanding is he never regained consciousness," said Lt. Dan Marincik of the Santa Rosa Police Department.
Police were prepared to arrest Patrick Oneill for his son's murder, had the young man survived.
"The officers who arrived at the scene located narcotics and narcotics paraphernalia in the bedroom, near where both of them were discovered" said Marincik.
The two were discovered by Guillory, who came to check on them, when she wasn't able to reach Oneill.
Father, toddler die from drug overdose, fentanyl exposure
The Santa Rosa father of the baby killed by drugs has also died of overdose.
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