Really? I read a CBC (who are very reputable) report confirming the man was merely a witness.
In a pair of tweets sent shortly after noon, the Sûreté du Québec confirmed one of the men arrested is now considered a witness.
Six men died in the shooting during evening prayers at the Centre Culturel Islamique de Québec (Islamic cultural centre of Quebec). Nineteen people were also wounded.
Police also said it's too early to know the motive, what charges may be laid or when the suspect will appear in court.
http://www.cbc.ca/news/canada/montreal/quebec-city-mosque-gun-shots-1.3957686