There were about 1100 police killings in 2019. This includes people shot or beaten to death by officers on or off duty. [1] About 10% of these people were unarmed. This statistic is the one which is most likely under-reported. About 50 police are feloniously killed per year [2]
[1] https://www.prisonpolicy.org/blog/2020/06/05/policekillings/ [2] https://www.fbi.gov/news/pressrel/press-releases/fbi-release...