Romans 3:23
NASB - 23 For all have sinned and fall short of the glory of God.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.
All non-Christians irregardless of how they die will be condemned to hell because they have rejected the Savior. They have not washed their robes clean so they don't have the right to enter through the gate into the city. Anybody who commits suicide is automatically subject to eternal condemnation. (Rev 22:12b,) Everyone will be given according to what he has done (the suicide being the last action of that person mean unconfessed sin therefore unforgiven sin). (Heb 9:27) There is no repentance after the state of death; this means that the suicide sin is carried along unto judgment.