This is a management failure. If not corrected, this person will eventually destroy the team and no progress will be made anyway. You should continue to bring

This is a management failure. If not corrected, this person will eventually destroy the team and no progress will be made anyway. You should continue to bring your concerns to your manager. Hopefully your manager will listen, or you will learn something you didn't consider previously. Without external pressure this other developer is unlikely to change. Unless you already share a deep trusting relationship with this person, you are unlikely to be able to affect change on your own.