Ontario provincial police say they transferred the suspect at the centre of last week's Amber Alert case into the custody of Quebec authorities.
The 41-year-old suspect was transported by ambulance to a Quebec hospital under Quebec provincial police escort, Ontario police say in a news release Friday.
The suspect had allegedly been in a coma in an Ottawa hospital after a reported suicide attempt in police custody.
Quebec police issued an Amber Alert for a six-year-old boy after they discovered the body of the child's mother last Thursday night in Saint- Eustache, north of Montreal.
Ontario police arrested the suspect one week ago in eastern Ontario, where his son was found safe in a stolen vehicle.
The suspect was charged this week with second-degree murder in the death of the boy's mother.
The suspect is also expected to be questioned following the death of 71-year Yvon Lacasse, whose SUV police say the suspect used while he was on the run.
Lacasse's body was found Wednesday in Arundel, also north of Montreal.
The suspect is due in court Wednesday in Saint-Jerome.