Even adding accidental deaths into the number does not make it believable. Illegals are about 4% of the population and the claim that they are responsible for over 11% of deaths by car and murder is not credible. Illegals are less likely to even have a car than a citizen so that makes the claim even more suspect.
The simple 4% figure distorts the demographics involved. Illegals form a greater proportion of the lower economic levels where a higher proportion of violent deaths occur. They are also a greater proportion in population centers where again higher proportion of violent deaths occur.