God is the God of our salvation and the issues of death belong to the Lord (Ps 68:20). Satan is the God of this world (2Cor 4:4), he is the father of all lies and is a murderer from the beginning (John 8:44). He walks to and fro through the earth (Job 1:7,2:2) seeking whom he may devour (1Pt 5:8). He is angry (Rev 12:12) and is an accuser (Rev 12:10). When Satan approached God concerning Job, God told him that he could touch all that Job had, but upon him, Satan could not touch (Job 1:12). When Jesus was in the wilderness praying and fasting, Satan came to tempt Him to cast Himself down from the pinnacle of the temple (Mt 4:5-7). In (1John 5;18) the wicked one touches us not.
With these verses of scripture we can see that we have an adversary (1Pt 5:8). This adversary is out to destroy lives as the god of this world, through the lust of the flesh, the lust of the eyes and the pride of life (1John 2:16). He has devices and strategies to accomplish what is in his heart, which we are not to be ignorant of (2Cor 2:11). With these deceives, the whole world lies (
or is set in place) in the wickedness of his authority (1John 5:19). That authority is the iniquity that was found in him (Ez 28:15) and is the mystery of iniquity that is presently working in this world system (2Th 2:7). He knows that the flesh of man is weak (Mt 26:41) and has been testing it since the time of Adam in the garden of Eden. Satan wants total dominion over all that God has created that lives as inhabitants of the earth (Lk 10:18, Rev 12:4,9,10, 17:2).
Satan could not take Job's life but he most definitely tried to get him to take his own (Job 2 & 3). Elijah ran for fear of his life because of Jezebel and under a juniper tree asked God to take his life but God rescued him through an angel (1Kgs 19:4,5). Saul was anointed king of Israel who disobeyed the voice of God and in battle had been severely wounded to the point of death. Knowing he would die and not wanting the enemy to thrust him through when they found him, he asked his armour bearer to finish him off, who refused, so Saul layed upon his own sword. Not being dead yet, a young Amalekite man came across Saul, who asked the Amalekite to finish him off and did (1Sam 31:1-6, 2Sam 1:8-10). Saul died in battle.
Think of the number of times that people have tried to commit suicide but failed, while others have succeeded. There is so much subjectivity involved in whether or not someone committed suicide, dealing with intent or from bad judgment or mistakes through negligence, that it should be left up to the one that God has committed all judgment to (John 5:22). Could we say that a person who commits a crime, knowing that the punishment is death, would be issuing his own death warrant as a form of judicial suicide because he regards not the life of others or his own? At the same time there are those cases that have no doubt as to intent and execution. Judas, as a disciple and a case in point, hanged himself because the guilt of betraying the innocent blood of the Son of man. He went to his place that was purchased with the (30) pieces of silver (Mt 27:3-10, Acts 1:18-20,25, Ps 69:25-28) with the reward of iniquity (Acts 1:18). He went as the son of perdition (John 17:12). These are some things to consider so that you can come to your own convictions.