Question: does nien nunb die in the last jedi

Answer: No, In the film, during the evacuation from the Resistance base of D'Qar, Nien Numb evacuates along his fellow soldiers from their base and fly into the space, being present aboard the Raddus during the battle of the Resistance's bombers against the Fulminatrix and the Supremacy. Numb later escapes offscreen along Leia and the other Resistance members from the Raddus, leaving Vice Admiral Holdo to sacrifice herself via crashing against the Supremacy. Following the evacuation of the Resistance from the old Rebellion base at the planet of Crait after Luke Skywalker's sacrifice, Nunb is seen talking with another member of the Resistance aboard the Millenium Falcon while escaping from the First Order's clutches once more.