From Ammoland:

Detroit’s population in 2018 was listed as 672,662. The number of murders in Detroit were listed as 261. This equates to a homicide rate of 38.8 per 100,000 population. It is the second highest city in the nation. However, the number of murders are considerably lower than they were in 2012, just before Chief Craig took over. The numbers of murders are the lowest in 50 years. The population of Detroit has dropped; thus the rate of murders is still high. The rate was 55.2 per 100,000 in 2012. In 2012, the interim police chief, Chester Logan, blamed the homicide rate on guns.