There's no doubt the pain Brett Demary feels now is immeasurable, but that pain could run even deeper, because Demary and his son may have seen it coming.

Only days after his 18-year-old son was killed, he told CTV News he'd urged his son to get a different job when the safety practices at his workplace raised suspicion.

Less than two weeks before he was crushed by a tractor trailer at the rail yard near Fort Saskatchewan, Cody Demary reportedly approached his father with concerns about the company's safety training for new workers.

Cody's father told CTV News he told his son to quit.

"I was really concerned about this," Cody's father Brett Demary said. "I said: ‘Cody, I think you need to quit, and find another job,

"‘This place isn't safe.'"

At any rate, the cause of the incident that took Cody Demary's life is up to Occupational Health and Safety to determine.

OHS has issued a stop-work order as they investigate the scene, and the tractor trailer involved has been seized for a mechanical inspection.

"We'll be looking at everything including the workplace training that has taken part," Barrie Harrison with OHS said. "That is regardless of whether a worker is 18 or 80."

Demary worked as a general labourer for International Bulk Services, a subsidiary of CN.

In a statement, the company said:

"This dreadful accident is a harsh reminder that our industry can be unforgiving,

"We are committed to safety and determined to get to the bottom of what happened in an effort to prevent this type of tragic accident in the future."

Investigators continued working at the scene of the incident Friday, however, the investigation could take months.

When it's completed, the report will be sent to the Crown who will decide if charges should be laid.

Until then, the family of Cody Demary is uniting in their grief, and remembering the young, fun-loving teenager.

However, in the long run, they have many questions to be answered.

With files from Scott Roberts