Sentence:  Isaac Pitt , one of the men from Lincoln , had taken a musket ball in his belly ; and though he had found the strength to run with us , now he collapsed and lay on the ground , <WSD>dying</WSD> , the Reverend holding his head and wiping his hot brow . 
Meaning of the word marked with <WSD> tags:  pass from physical life and lose all bodily attributes and functions necessary to sustain life