There are several really dangerous jobs such as police officer, fire fighter, swat teams, rescue workers, prison guards etc.
But the actual job that is considered the most dangerous with the highest amount of deaths from the job is logging workers who have a pretty high rate of deaths per year.
Aircraft pilots is another dangerous job or flying of any aircraft including helicopter pilots.
Roofing, Iron Workers, Fishers and Fishing Related Jobs as well as Refuse and recyclable material collectors.
But being a police officer or prison guard and fire fighter is pretty dangerous due to the potential of getting shot and killed and for a firefighter you could get caught in a fire or get smoke inhalation when trying to rescue someone or get trapped in a wildfire etc.