Lee Najjar

Lee Najjar -- best known to "The Real Housewives of Atlanta" fans as Kim Zolciak’s elusive "Big Poppa" sugar daddy -- has died at 68. The wealthy Atlanta real estate investor passed away Saturday, April 18 -- tragic news confirmed by his daughter Katelin via a slate of IG Story pictures of them…

Lee Najjar -- who was known on "Real Housewives" as Kim Zolciak's mysterious ex-sugar daddy "Big Poppa" -- was arrested in Atlanta this week ... TMZ has learned. Najjar was taken into custody by the Fulton County Sheriff's Dept. on November 6 ... though it's unclear why he was arrested. According…