Fahmi was born from an Egyptian father and a Lebanese mother from the influential Zein family.

He held various offices in the Lebanese Army: head of the bomb squad removal unit, head commander of the Mount Lebanon military region, and the security department of the military intelligence services.

Fahmi studied at the James Madison University in the United States.

[4][5][6] On 26 June 2020, Fahmi mentioned in an interview at Al-Manar, that he killed two people in 1981 during the Lebanese Civil War, and Michel Aoun promised to protect him back then.

[7] Some analysts wrote that the incident might have happened on 25 November 1978, when Fahmi was a lieutenant officer in the Defense Regiment and Major Michel Aoun was a deputy commander of the First Defense Regiment in Baabda District.