Philippe Steele Morin was stopped by police while travelling north on Highway 309 near Buckingham, police sources confirmed.
Morin faces a charge of second-degree murder of the 36-year-old Boisvert.
Boisvert's body was found in the woods northeast of the village of Quyon, Que., on Jan. 23. She had disappeared from her home in Montreal a week earlier.
Montreal police are leading the investigation.
More to come.