I have two Jessamine plants each in a seperate pot on my roof top patio. After about 5 months one of them began to turn brown and quickly died. The other one has been doing fine until the other week i noticed it's leaves turning also. What could be causing this. I have a photo available.

Jessamine plants enjoy indirect light, it is possible that they are getting too much light as you have it on your roof top. another possibility is that it may have become rootbound. The roots to this plant grow at a very quick rate, making it difficult to keep in a pot sometimes.
Hope this helps

Mike