Kellman was born in Saint Michael, Barbados, but when he was still young, his family moved to Montreal, Quebec, Canada.

Onyx regained the Quebec title a month later in a three-way dance with Sunny Warcloud and Manuel Vegas.

On October 15, 2004 Onyx won the NWA British Commonwealth Heavyweight Championship defeating Australia's Will Phoenix in Winnipeg.

Two days later, Onyx beat Paul Tracey for the NWA United Kingdom Heavyweight Championship in Maidstone Kent.

On October 8, 2005 in Nashville, Tennessee at the NWA 57th anniversary show Fergal Devitt once again defeated Onyx for the British Commonwealth title.

Coming back from the Inoki Dojo Onyx captured more NWA gold on April 22, 2006 in Southern Championship Wrestling.

In Almonte Springs, Florida, Onyx defeated Thomas Marr and Chasyn Rance in a three-way to win the NWA North American Heavyweight Championship.

Subsequently, he defended the North American title in both Canada and the United States, including on July 7, 2006 at a Total Nonstop Action Wrestling house show.

After an over one-year reign as North American Heavyweight Champion, he lost the title to Damien Waynes on August 24, 2007 in Las Vegas, Nevada.

7 in the main event Sylvain Grenier & Hurricane Helms defeated Dru Onyx & Shelton Benjamin.

For his next three NSPW appearances, he reverted to his Dru Onyx persona, winning a match against Michael Style on March 20.

On May 8 Onyx participated in a 4-way match for the NSPW Heavyweight title against champion Kevin Skully, Michael Style and Mathieu St-Jacques.

On August 6, Onyx got another shot at the NSPW Heavyweight title again St-Jacques, once again coming up short in his bid for the championship.

He bounced back with a win over Michael Style on September 8 and finished off 2010 with a loss in a chain match against Ismael.

During his reign as champion, Onyx successfully defended the title against Jay Phenomenon, Handsome JF, Guénette, Gorgeous Mike, Pitbull Brando, William Brady, James Stone and Alextreme.

He feuded with Pat Guénette, and they competed in a no disqualification match on June 22 at Fight Nationale for the Québec championship.

Onyx along with Derek Platinum lost to the GCW-NS champions the Hillbullies (Jeff Black and Cousin Eddie) on February 4, 2012 in Oshawa.

In 2011, Onyx received in invitation to train at WWE's developmental camp in Florida and wrestle at several of their house shows.

2014-2015 Onyx worked on a French-Canadian sitcom produced by Radio Canada’s called La Theorie Du K.O.