For the British merchant fleet, 19.5 deaths per 100,000 seafarer-years [1].
For American loggers, 90 deaths per 100,000 worker-years [2] making it the most dangerous job.
For American taxi drivers, ~18 deaths (of which 8 are murders) per 100,000 full-time-worker-years [2]. Making taxi driver the most murdered profession - and it was worse around 2000, when the rate was an eye-watering 23.7 murders.
As you say, policing isn't the most dangerous profession; the rate there is 11 deaths of which 3.5 are murders.
[1] https://academic.oup.com/occmed/article/64/4/259/1464740
[2] https://www.washingtonpost.com/news/wonk/wp/2015/01/28/chart...