Siblings Alex and Keeley regularly visit their dad's grave in a peaceful Essex cemetery to remove weeds and lay new flowers.
Although their father had been a drug and alcohol user for most of his adult life, they had both believed he was "on the up" with the help of a local treatment service.
But on 2 July 2023, they got a devastating call to say he had died from an overdose after he was found unresponsive at home.
They later learned the drugs taken included a new and highly toxic compound, one of several synthetic opioids called nitazenes, which are many times stronger than heroin.
Their father is one of 179 people in England recorded as having died from nitazenes in the past year, with the highest number of deaths occurring in the East of England.