Jackson

Jackson is a soldier from District 13. She is part of Squad 451 and is second in command to Boggs.

After Boggs dies during their mission in the Capitol, she demands that Katniss give her the Holo. Katniss lies to her and says that President Coin authorized her to take charge and to lead a mission to assassinate President Snow. Cressida supports Katniss' lie which seems to help convince Jackson to allow Katniss to take charge.

Death
Jackson and Leeg 1 sacrifice their lives at the meat grinder pod in order to hold off the lizard mutts and allow Katniss and the other members of the team a chance to escape. Later Katniss regrets having lied to Jackson and inadvertently getting her killed but Cressida reassures her that Jackson knew they were lying but wanted to push forward with the mission regardless because she trusted Boggs who clearly wanted Katniss to go on.

Physical Description
Jackson is a middle-aged woman who looks kind of sluggish. She is farsighted which gives her the advantage of being able to shoot things that the other members of her team can't see without a scope.