A former official in the powerful Iranian-backed Lebanese group Hezbollah was found dead in his flat in a Beirut neighborhood, the state-run Lebanese news agency said on Sunday. Security forces immediately opened an investigation and were awaiting the arrival of a forensic doctor to determine the cause of death, National News Agency said, giving only the initials of the man. A Hezbollah official who requested anonymity confirmed the death of Ali Hatoum and told Reuters an investigation was under way but that it did not appear to be security related.