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Confined space, almost no oxygen. Two breaths -- dead. Actually happens, a standard danger in industry, one people are normally trained to avoid.

It would be nice to know if there were other people around when this happened and how many people were in the building. He may have been trained to avoid walking into a room with no oxygen, but he probably wasn't train to avoid being pushed. More facts about the circumstances are necessary before we can write this one off as a true accident.

It sounds like the nitrogen leaked from a unit used to keep very low temps. That doesn't preclude his being accompanied into the unit under threats against his children, handing over the vial, and then the leak being manufactured and his being held in there. All the better for them if it only took a few minutes for it to kill him.
Also I think it's ugly that his wife had to call because he did not come home from work. And it sounds like they found him the next morning? Or at least it doesn't sound like his entrance into the unit was during a busy time with a lot of people around.