Question: did newt die in the death cure book

Answer: Yes, In Denver, Thomas sees Newt, who has succumbed to the Flare. Newt begs Thomas to end his suffering and kill him. Thomas shoots him in the head as an act of mercy. Then, they discover that Teresa and the other Immunes all had been captured. Thomas and Minho knock out the Immunes' former guards and threaten them to make the guards take them to WICKED also. Thomas and Brenda discover the guards were led by Vince, the leader of the Right Arm. Vince tells them the Right Arm is copying WICKED's operations, and plan to take over their headquarters building.