An oilfield worker has been killed and two other workers are in hospital after being exposed to a deadly gas while on the job.

RCMP says the gas exposure happened just before 9 p.m. on a site near Fox Creek, just off of Highway 947 and the ANC road Saturday.

Occupational Health and Safety say the workers were steaming a gas production line when the machine they were using released the poisonous gas H2S.

A stop-work order has been issued and the site will be shut down and secured until OHS has completed its investigation.

"It will certainly be why there was a release of H2S gas and what caused that," said Tracey Kipta, spokesperson for OHS. "Just want to make sure the equipment and the site is safe so workers can return as soon as possible."

The two injured workers were taken to the Fox Creek Hospital where they are recovering. The other worker was found deceased on scene. The victim's name has not been released.

There is no word when the investigation will conclude.

On Sunday, the "Steps for Walk" took place at Sir Wilfred Laurier Park, which paid tribute to those that lost their lives while at the workplace.

Employment and Immigration Minister Thomas Lukaszuk was on hand, where he released the 2010 OHS figures for workplace deaths. The report shows that 136 Albertans died on the job last year.

For family members in attendance, they say the event not only raises awareness but gives others a chance to come together and heal.

"This is to let them know that there is help out there," said Ron Rauhut, whose sister died in a workplace accident. "That there are people you can talk to, to help you through your journey of healing."

Money raised from the walk will go towards family support programs.