We are truly concerned about the well-being of your online friend. Firstly, we want to remind you that God cares deeply about each of us, and He is the ultimate source of help and comfort. It is crucial to pray for this person, but it is also important to understand that God wants us to be active in His will not just reactive.
Since you have no contact, it is important to reach out to the email service and local authorities. Email services often have provisions for these types of things. This is especially important as there is a possibility this person may have already harmed himself. Prayer is important, but so is action. Jesus did not come to save the righteous and untroubled but instead sinners. This person will not be saved by an angel but only by the name of Jesus. Jesus is our only hope for salvation and the only name by which we can be saved.
The Bible tells us to bear one another's burdens and so fulfill the law of Christ. Also, we should not just talk about our love and prayers but show it in our actions. We are reminded of this truth in 1 John 3:18, Little children, let us not love in word, neither in tongue; but in deed and in truth.
Let us pray together:
Dear Heavenly Father, we come before You in the name of Jesus, lifting up this person who is in deep distress and considering ending his life. We pray that Your Holy Spirit would intercede and surround him with Your love and comfort. We pray that whatever is causing his pain and despair would be overcome by Your presence. We ask that You will bring someone into his life who can help him, whether it is a friend, family member, or professional counselor. Your word says you are close to the brokenhearted and saves those who are crushed in spirit. Please save this person and show them your love only found in Jesus.
Father, we also pray for wisdom and guidance for his friends, that they may know how to help and support him in this difficult time. We ask that You will bring peace and hope to his heart, and that he will come to know the saving grace of Jesus Christ. We rebuke the spirit of suicide and depression, and we proclaim life and hope in the name of Jesus. May the power of the enemy be broken in his life, and may he find true life in Christ.
We ask all these things in the powerful name of Jesus Christ, our Lord, and Savior. Amen.
Please continue to pray for him and do what is possible to help. This is important as it could be the difference between life and death. If you have not already, consider reaching out to professionals or authorities as needed. Keep pushing and praying for them to come to know Jesus Christ, for we know that the gospel of Jesus Christ is able to bring hope, salvation, and eternal life.
Prayer Focus: God, Thank You. Thank You for loving me. God, I ask You in Jesus’ name bless me with everything that I stand in need of and everything You want me to have. Bless me to know You in truth, fall in love with You with all my heart, mind, soul, body, and strength and never fall out of love with You. Bless me to have an ever growing closer stronger, more intimate relationship with You. Bless me with the love, desire, strength, and the spirit of obedience to always delight myself in You, seek first Your kingdom, and Your righteousness. Help and strengthen me God to always respect and obey You. Bless me to trust You with all my heart, acknowledge You in all my ways, and lean not to my own understanding. 
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