Maurice Boucher

He was sent to serve three life sentences at Canada's only supermax prison, in Sainte-Anne-des-Plaines. While imprisoned there, Boucher survived several assassination attempts motivated by his infamy, and was placed in a special unit of the prison to isolate him. Authorities transferred him in June 2022 to the nearby Archambault Institution under conditions of secrecy so he could receive palliative care following the metastasis of his throat cancer. He died 10 July 2022.
Boucher had two children, Alexandra Mongeau and Francis Boucher, who have also been involved in organized crime. Provided by Wikipedia