My friend he committed suicide . thats hell for sure .
Here is the thing. It is God's will and desire that none shall perish but all shall have ever lasting life.
I believe that it is biblically sound that God hears and answer all prayers that are aligned with His will and desire. If you pray for someone's salvation God heard that prayer even before He created the universe and I believe that it would be His will and desire to answer it.
I don't believe that suicide is the unpardonable sin, or even, in some cases, a sin at all but rather a tragic ending for someone with an extremely troubled mind / mentally unstable / or both. Unless you are God you can't say at all with any degree of certainty that someone is or has gone to hell.
Despite our understanding or lack of understanding God is most certainly capable of accomplishing His will and desire. This is a spiritual truth that is not predicated on our own understanding.