This happens when you are operating in the flesh, the work of the flesh. But if you are led by the Spirit in studying, meditating, praying and fasting, then you can crucify those fleshly sins. Then if you are living in the Spirit you will not be walking in the flesh. You can kill a person with the tongue, just like the Jews falsely accused the Lord of life with the tongue, you can kill a person with the pen as David penned Uriah to death, and you can kill a person with a plot as Jezebel plotted against Naboth. There are millions who abort their babies every year.
Abortion is outright murder.
Again many are influenced by our society through TV, movies and music that tempts many to sexual immorality. And it came to pass in the time of her travail, that, behold, twins were in her womb. But when it pleased God, who separated me from my mother's womb, and called me by his grace, False teachers are murderers The false teachers either will starve souls by not teaching the pure word of God to death and they can poison the soul to death, also they can infect the soul to death. Today we see churches not preaching the full council of God to the church. They do not preach and expose on the sovereignty of God, the attributes of God, the nature of sin, the atonement, justification, sanctification, instead their theology is wrapped around end times rapture.