Iscariot, (Judas) killed himself and went straight to hell, the True Orthodox Church does not pray for him.
There were two apostles who betrayed the Lord, Iscariot and Apostle Peter.
The first one, full of pride, could not repent, and tormented by his conscience, killed himself.
Apostle Peter was humble and repented for betraying the Lord to such extent that every time he heard a cock singing, he shed bitter tears for what he did.
The Church is very clear and states that suicide is a direct path to hell, and she doesn't offer a panikhida (memorial service) nor a burial, and not a single prayer for people who killed themselves. People who committed suicide can not be buried in any Church cemetery, or in holy ground.