Ontario’s Special Investigations Unit is looking into the shooting death of a former B.C. resident who was once the subject of a police warning in Vancouver.

Jermaine Anthony Carby, 33, was shot and killed by Peel Regional Police during a traffic stop in Brampton Ontario on Wednesday.

Witnesses said Carby was holding a knife before the shooting. A video taken by a witness appears to show an officer telling Carby to drop the knife before police opened fire.

“I heard the police officers say ‘Drop the knife,’ a couple of times, and something to the effect of ‘Don’t make us shoot you,” said witness Richard Appleby.

In 2011, the Vancouver Police Department publicly identified Carby as a vicious drug dealer who used brute force to collect drug debts calling him “one of the best-known street-level enforcers in the Downtown Eastside with a long history of violence drug trafficking and drug possession.”

Vancouver Police said they had dealt with Carby 110 times. In 2011 he was charged with manslaughter in the fatal stabbing of a 50-year-old man in Oppenheimer Park and was also charged for violently assaulting two women in the Downtown Eastside.

In 2012 Carby moved back to Ontario where his family lives.

Since the incident was a fatal police shooting, civilian investigators from Ontario’s Special Investigations Unit are now working on the case.

With a report from CTV Vancouver’s Lisa Rossington