Gabriel Wortman murdered 22 people during a rampage in Nova Scotia in April 

New video allegedly shows the gunman withdrawing $475,000 in cash from a Brink's office 19 days before the massacre  

Police sources say the withdrawal matched the method the Royal Canadian Mounted Police uses to send money to confidential informants and agents 

The RCMP has repeatedly insisted that it had no 'special relationship' with Wortman, who was killed by police following the attack

But critics argue that the agency could be hiding ties to Wortman to avoid accusations that it mishandled the case

The speculation comes as authorities are reportedly investigating Wortman's relationships with people linked to organized crime