One of those things that God is said to hate are the hands that shed innocent blood. In other words it the murderer that God hates.
The murderer engages in the devil's activity. The devil is described as a murderer from the beginning, and abode not in the truth, because there is no truth in him, John 8:44. To murder is to the devil's work.
The murderer takes away life that God has given. God is the author of life and no one, of themselves, has the right to take away the life of another. The only exceptions the Bible recognises are capital punishment, just war and self defence. Any other taking away of life is unjustifiable murder and is hateful to God.
The murderer destroys the image of God. Human beings are created in God's likeness. That likeness has been greatly corrupted and eroded by the Fall of mankind into sin. Nevertheless that divine image is still present to some degree. We are rational and spiritual creatures. We have an immortal soul that shall never die. To take away innocent life is to take away that which bears the image of God.