Omar Devone Little is a fictional character on the HBO crime drama series The Wire, portrayed by Michael K. Williams. He is a notorious Baltimore stick-up man, who frequently robs street-level drug dealers. He is legendary around the inner city for his characteristic duster, under which he hides his shotgun, large caliber handgun, and bulletproof vest, as well as for his facial scar and his whistling of "The Farmer in the Dell" when stalking targets. Omar's homosexual character is based on the heterosexual Baltimore area robber and hitman Donnie Andrews.
https://en.wikipedia.org/wiki/Omar_Little