Thanks everyone, and especially thankyou Suzi. I'll look into that website for sure, and I definitely made it clear to the person in my pm that I was there to listen if they needed to talk.
Unfortunately the individual deleted their FB page and probably didn't read my message. A friend of this person's was on the fb transgender support groups page and told me and the other members that the person had a second page. On that one the 'About' page had a message stating that the person would commit suicide on the 20th of this month specifically. Members tried reaching this person on that page as well, but I don't think anyone got a response.
A little later the friend posted this: "Okay. The police called me. ***** opened the door and talked to an officer. He said he has an appointment Thursday with his therapist and looked the officer in the eye and promised he would not hurt himself before the appointment. He said that ***** was pleased with the contact he had with that officer, that he was treated very well."
I am somewhat relieved, but this person can't be out of the woods yet. What makes me hopeful is that this friend seems care alot, and if their messages indicate anything it's that this person has many friends who care about him. I'm keeping my eye on the fb page every now and again. Not sure I'll send another message I don't want to be invasive, but if they write another suicide note I want to catch it so I can do something.