On November 14, 1996, a masked man, fired at least five bullets at Demers as he was exiting his car outside a corner store in a Quebec City suburb.
[6] On 23 August 1998, a team of Rock Machine members led by Fred Faucher, included hitman Gerald Gallant and Marcel Demers, they rode by on their motorcycles and gunned down Paolo Cotroni in his driveway.
On 6 December 2000, Demers along with national president, Frédéric Faucher were arrested on multiple charges and for ordering a bombing that caused major damage to a Hells Angels bunker and the surrounding neighborhood located in Saint-Nicolas, Quebec.
Police reported that Demers arrest was due to is involvement in, what authorities dubbed a "narcotics empire", stating he along with Faucher had been responsible for the bombing of the bunker and several other incidents between 1994 and 2000.
According to authorities, the Rock Machine chapters in Quebec under Demers and Faucher were responsible for distributed two kilograms of cocaine a month and generated almost $5 million in profits annually.
Gallant had attempted to flee to Geneva, Switzerland but was eventually arrested on credit card fraud and mistaken identity, testifying and giving more than fifty hours of statements.
It was revealed that Demers had left his life of crime behind and for several years he had held a job at a sprinkler company, he had also made attempts to reconcile with his family, forming a bond with his son that he did not have during his criminal days.