A fuel injector (100; 400; 500; 600) for a combustor of a gas turbine, the fuel injector extending along a longitudinal axis (L INJ) and comprising: a frame having oppositely disposed end walls, a first side wall fuel injection body (360, 460, 560) defining a first fuel plenum (370, 470, 570), and, opposite the first side wall fuel injection body, a second side wall fuel injection body (360, 460, 560) defining a second fuel plenum (370, 470, 570), the first side wall fuel injection body and the second side wall fuel injection body extending axially between the end walls, wherein the first side wall fuel injection body and the second side wall fuel injection body define the sides of the frame and, with the end walls, define an opening for passage of air; a third fuel injection body (340, 340a, 340b) defining a third fuel plenum (350, 350a, 350b), the third fuel injection body extending axially between the end walls and being positioned between the first side wall fuel injection body (360, 460, 560) and the second side wall fuel injection body (360, 460, 560), such that air flow paths are defined between the third fuel injection body (340, 340a, 340b) and each of the first side wall fuel injection body and the second side wall fuel injection body; and a conduit fitting configured for connection to a fuel supply line of the combustor, coupled to the frame and fluidly connected to the third fuel plenum (350, 350a, 350b); wherein the first side wall fuel injection body (360, 460, 560) comprises at least one outer surface (366, 368) through which a first plurality of fuel injection ports (374, 474, 574) is defined, the second side wall fuel injection body (360, 460, 560) comprises at least one outer surface (366, 368) through which a second plurality of fuel injection ports (374, 474, 574) is defined, and the third fuel injection body (340, 340a, 340b) comprises at least one outer surface (346, 348) through which a third plurality of fuel injection ports is defined, each plurality of fuel injection ports (374, 474, 574, 346, 348) being in fluid communication with the respective fuel plenum (350, 350a, 350b, 370, 470, 570) and an adjacent air flow path of the air flow paths. a frame having oppositely disposed end walls, a first side wall fuel injection body (360, 460, 560) defining a first fuel plenum (370, 470, 570), and, opposite the first side wall fuel injection body, a second side wall fuel injection body (360, 460, 560) defining a second fuel plenum (370, 470, 570), the first side wall fuel injection body and the second side wall fuel injection body extending axially between the end walls, wherein the first side wall fuel injection body and the second side wall fuel injection body define the sides of the frame and, with the end walls, define an opening for passage of air; a third fuel injection body (340, 340a, 340b) defining a third fuel plenum (350, 350a, 350b), the third fuel injection body extending axially between the end walls and being positioned between the first side wall fuel injection body (360, 460, 560) and the second side wall fuel injection body (360, 460, 560), such that air flow paths are defined between the third fuel injection body (340, 340a, 340b) and each of the first side wall fuel injection body and the second side wall fuel injection body; and a conduit fitting configured for connection to a fuel supply line of the combustor, coupled to the frame and fluidly connected to the third fuel plenum (350, 350a, 350b); wherein the first side wall fuel injection body (360, 460, 560) comprises at least one outer surface (366, 368) through which a first plurality of fuel injection ports (374, 474, 574) is defined, the second side wall fuel injection body (360, 460, 560) comprises at least one outer surface (366, 368) through which a second plurality of fuel injection ports (374, 474, 574) is defined, and the third fuel injection body (340, 340a, 340b) comprises at least one outer surface (346, 348) through which a third plurality of fuel injection ports is defined, each plurality of fuel injection ports (374, 474, 574, 346, 348) being in fluid communication with the respective fuel plenum (350, 350a, 350b, 370, 470, 570) and an adjacent air flow path of the air flow paths.