Key findings from UNODC Global Study on Homicide 2019 (copypasting from the PDF):

UNODC estimates that a total of 464,000 deaths were caused by intentional homicide worldwide in 2017.
The largest share (37 per cent) was registered in the Americas, closely followed by Africa, which accounted
for just over a third (35 per cent) of the total. Despite its large population, Asia accounted for less than a
quarter of the total (23 per cent), while Europe (4.7 per cent) and Oceania (0.2 per cent) accounted for by
far the smallest shares.

Excluding all the subregions of Africa, for which complete data are not available, Central America and South
America, at 25.9 and 24.2 per 100,000 population, respectively, were the subregions with the highest
average homicide rates in 2017, followed by the Caribbean, at 15.1 per 100,000 population. By contrast,
the subregions with the lowest levels of homicide, at around 1 victim per 100,000 population per year,
were Southern, Western and Northern Europe, East Asia and Oceania (Australia and New Zealand).

In Central America, the highest national homicide rate (62.1) is over seven times higher than the lowest
(8.3). In South America, the highest national homicide rate (56.8) is over 16 times higher than the lowest
(3.5). In South-East Asia, there are also large intraregional differences in the homicide rate, with the highest
national rate being 44 times higher than the lowest. Western Europe is the most homogenous subregion
in terms of homicide rates, although there are still disparities: the highest national rate (1.7) is more than
three times the lowest (0.5).

Note that homicide data from Africa, the Middle East, and East Asia is UNRELIABLE. The figures may be inaccurate, by which I mean significantly underestimated because the crimes don’t get recorded.

The least murderous South American country has a higher murder rate than the most murderous Western European country.