Which animal species are known not to murder (a targeted attack leading to death) members of their own species?
Here are a few suggestions:


Any coral
Any sponge
Blue mussels
Sheep
Dugong
brown-headed cowbird 
Blue whale
Common earwigs
Plasmodium falciparum (causing malaria)


If by the use of the term "evidence", you are expecting a peer-review paper that discuss the matter, I am afraid you wont find any as it is not really a question of interest to researchers. If you can prove wrong any of the above suggestions I will be happy to remove it (and eventually add some others).