Bill C-31 is the bill that suspended the OAS payment to inmates essentially because the prison system already provides for basic needs. This bill prevents killers from benefiting from their crime. The distinction would be that under C-31, if someone has killed a spouse and is an inmate and does not receive OAS, when this person turns 60, in absence of this bill, they could receive the survivor allowance under OAS. This bill would prevent that. It's adding to the provision if you like.
On October 21st, 2014. See this statement in context.