Beloved, may the Lord bless you for your concern and your prudence.
Usually if someone shares they want to end their life, they are in pain and want help.
But...we can never know, so I appreciate that you are being prudent in this situation!
I have prayed, and have hope that the Lord will be strong on the behalf of both you and your friend.
When you have done all you can, stand. And trust God to deal with His own.
Lord God, we ask you for mercy, and so, so much grace for this person, unknown to us, but known and beloved by You.
Abba, I pray You will show this person just how very much You love, and how important they are to You.
I ask You to strengthen these two, and to be their strength and their hope and their future.
And when you have finished renewing this one, please give him or her a vast and mighty testimony of all You have done.
Renew this person's love for You, and restore to them the JOY of Your salvation, in Jesus' Name, amen.