Much-loved Mount Druitt police officer, Constable Matthew Montesin, died on Wednesday.
Constable Montesin, who was 40, was diagnosed with terminal cancer of the lungs last year.
He worked in general duties in the Mount Druitt local command for more than three years.
He was affectionately known as Monty and described by colleagues as "a likeable, hard-working constable who always endeavoured to provide the best possible service to his community".
Constable Montesin had three sons, all of whom he chose to raise in western Sydney where he grew up.
He was diagnosed with cancer late last year.
Colleagues said his death was a great loss to them and to his family, with whom all their prayers and thoughts now were.